-2(x+3)3x=10

Solution for -2(x+3)3x=10 equation:

Simplifying
-2(x + 3) * 3x = 10

Reorder the terms:
-2(3 + x) * 3x = 10

Reorder the terms for easier multiplication:
-2 * 3x(3 + x) = 10

Multiply -2 * 3
-6x(3 + x) = 10
(3 * -6x + x * -6x) = 10
(-18x + -6x2) = 10

Solving
-18x + -6x2 = 10

Solving for variable 'x'.

Reorder the terms:
-10 + -18x + -6x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + -18x + -6x2 = 0

Factor out the Greatest Common Factor (GCF), '-2'.
-2(5 + 9x + 3x2) = 0

Ignore the factor -2.
Subproblem 1
Set the factor '(5 + 9x + 3x2)' equal to zero and attempt to solve:

Simplifying
5 + 9x + 3x2 = 0

Solving
5 + 9x + 3x2 = 0

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

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

Move the constant term to the right:

Add '-1.666666667' to each side of the equation.
1.666666667 + 3x + -1.666666667 + x2 = 0 + -1.666666667

Reorder the terms:
1.666666667 + -1.666666667 + 3x + x2 = 0 + -1.666666667

Combine like terms: 1.666666667 + -1.666666667 = 0.000000000
0.000000000 + 3x + x2 = 0 + -1.666666667
3x + x2 = 0 + -1.666666667

Combine like terms: 0 + -1.666666667 = -1.666666667
3x + x2 = -1.666666667

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = -1.666666667 + 2.25

Reorder the terms:
2.25 + 3x + x2 = -1.666666667 + 2.25

Combine like terms: -1.666666667 + 2.25 = 0.583333333
2.25 + 3x + x2 = 0.583333333

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 0.583333333

Calculate the square root of the right side: 0.763762616

Break this problem into two subproblems by setting 
(x + 1.5) equal to 0.763762616 and -0.763762616.

Subproblem 1
x + 1.5 = 0.763762616

Simplifying
x + 1.5 = 0.763762616

Reorder the terms:
1.5 + x = 0.763762616

Solving
1.5 + x = 0.763762616

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = 0.763762616 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = 0.763762616 + -1.5
x = 0.763762616 + -1.5

Combine like terms: 0.763762616 + -1.5 = -0.736237384
x = -0.736237384

Simplifying
x = -0.736237384

Subproblem 2
x + 1.5 = -0.763762616

Simplifying
x + 1.5 = -0.763762616

Reorder the terms:
1.5 + x = -0.763762616

Solving
1.5 + x = -0.763762616

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = -0.763762616 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = -0.763762616 + -1.5
x = -0.763762616 + -1.5

Combine like terms: -0.763762616 + -1.5 = -2.263762616
x = -2.263762616

Simplifying
x = -2.263762616

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.736237384, -2.263762616}
Solution
x = {-0.736237384, -2.263762616}