99=33x*3(3x+5)

Solution for 99=33x*3(3x+5) equation:

Simplifying
99 = 33x * 3(3x + 5)

Reorder the terms:
99 = 33x * 3(5 + 3x)

Reorder the terms for easier multiplication:
99 = 33 * 3x(5 + 3x)

Multiply 33 * 3
99 = 99x(5 + 3x)
99 = (5 * 99x + 3x * 99x)
99 = (495x + 297x2)

Solving
99 = 495x + 297x2

Solving for variable 'x'.

Reorder the terms:
99 + -495x + -297x2 = 495x + -495x + 297x2 + -297x2

Combine like terms: 495x + -495x = 0
99 + -495x + -297x2 = 0 + 297x2 + -297x2
99 + -495x + -297x2 = 297x2 + -297x2

Combine like terms: 297x2 + -297x2 = 0
99 + -495x + -297x2 = 0

Factor out the Greatest Common Factor (GCF), '99'.
99(1 + -5x + -3x2) = 0

Ignore the factor 99.
Subproblem 1
Set the factor '(1 + -5x + -3x2)' equal to zero and attempt to solve:

Simplifying
1 + -5x + -3x2 = 0

Solving
1 + -5x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-0.3333333333 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + 1.666666667x + 0.3333333333 + x2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + 1.666666667x + x2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + 1.666666667x + x2 = 0 + 0.3333333333
1.666666667x + x2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
1.666666667x + x2 = 0.3333333333

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 0.3333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 0.3333333333 + 0.6944444447

Combine like terms: 0.3333333333 + 0.6944444447 = 1.027777778
0.6944444447 + 1.666666667x + x2 = 1.027777778

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 1.027777778

Calculate the square root of the right side: 1.013793755

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 1.013793755 and -1.013793755.

Subproblem 1
x + 0.8333333335 = 1.013793755

Simplifying
x + 0.8333333335 = 1.013793755

Reorder the terms:
0.8333333335 + x = 1.013793755

Solving
0.8333333335 + x = 1.013793755

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.8333333335' to each side of the equation.
0.8333333335 + -0.8333333335 + x = 1.013793755 + -0.8333333335

Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000
0.0000000000 + x = 1.013793755 + -0.8333333335
x = 1.013793755 + -0.8333333335

Combine like terms: 1.013793755 + -0.8333333335 = 0.1804604215
x = 0.1804604215

Simplifying
x = 0.1804604215

Subproblem 2
x + 0.8333333335 = -1.013793755

Simplifying
x + 0.8333333335 = -1.013793755

Reorder the terms:
0.8333333335 + x = -1.013793755

Solving
0.8333333335 + x = -1.013793755

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.8333333335' to each side of the equation.
0.8333333335 + -0.8333333335 + x = -1.013793755 + -0.8333333335

Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000
0.0000000000 + x = -1.013793755 + -0.8333333335
x = -1.013793755 + -0.8333333335

Combine like terms: -1.013793755 + -0.8333333335 = -1.8471270885
x = -1.8471270885

Simplifying
x = -1.8471270885

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.1804604215, -1.8471270885}
Solution
x = {0.1804604215, -1.8471270885}