9(13-x)-4x=5(21-2x)9x

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Solution for 9(13-x)-4x=5(21-2x)9x equation:


Simplifying
9(13 + -1x) + -4x = 5(21 + -2x) * 9x
(13 * 9 + -1x * 9) + -4x = 5(21 + -2x) * 9x
(117 + -9x) + -4x = 5(21 + -2x) * 9x

Combine like terms: -9x + -4x = -13x
117 + -13x = 5(21 + -2x) * 9x

Reorder the terms for easier multiplication:
117 + -13x = 5 * 9x(21 + -2x)

Multiply 5 * 9
117 + -13x = 45x(21 + -2x)
117 + -13x = (21 * 45x + -2x * 45x)
117 + -13x = (945x + -90x2)

Solving
117 + -13x = 945x + -90x2

Solving for variable 'x'.

Combine like terms: -13x + -945x = -958x
117 + -958x + 90x2 = 945x + -90x2 + -945x + 90x2

Reorder the terms:
117 + -958x + 90x2 = 945x + -945x + -90x2 + 90x2

Combine like terms: 945x + -945x = 0
117 + -958x + 90x2 = 0 + -90x2 + 90x2
117 + -958x + 90x2 = -90x2 + 90x2

Combine like terms: -90x2 + 90x2 = 0
117 + -958x + 90x2 = 0

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

Divide each side by '90'.
1.3 + -10.64444444x + x2 = 0

Move the constant term to the right:

Add '-1.3' to each side of the equation.
1.3 + -10.64444444x + -1.3 + x2 = 0 + -1.3

Reorder the terms:
1.3 + -1.3 + -10.64444444x + x2 = 0 + -1.3

Combine like terms: 1.3 + -1.3 = 0.0
0.0 + -10.64444444x + x2 = 0 + -1.3
-10.64444444x + x2 = 0 + -1.3

Combine like terms: 0 + -1.3 = -1.3
-10.64444444x + x2 = -1.3

The x term is -10.64444444x.  Take half its coefficient (-5.32222222).
Square it (28.32604936) and add it to both sides.

Add '28.32604936' to each side of the equation.
-10.64444444x + 28.32604936 + x2 = -1.3 + 28.32604936

Reorder the terms:
28.32604936 + -10.64444444x + x2 = -1.3 + 28.32604936

Combine like terms: -1.3 + 28.32604936 = 27.02604936
28.32604936 + -10.64444444x + x2 = 27.02604936

Factor a perfect square on the left side:
(x + -5.32222222)(x + -5.32222222) = 27.02604936

Calculate the square root of the right side: 5.198658419

Break this problem into two subproblems by setting 
(x + -5.32222222) equal to 5.198658419 and -5.198658419.

Subproblem 1

x + -5.32222222 = 5.198658419 Simplifying x + -5.32222222 = 5.198658419 Reorder the terms: -5.32222222 + x = 5.198658419 Solving -5.32222222 + x = 5.198658419 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.32222222' to each side of the equation. -5.32222222 + 5.32222222 + x = 5.198658419 + 5.32222222 Combine like terms: -5.32222222 + 5.32222222 = 0.00000000 0.00000000 + x = 5.198658419 + 5.32222222 x = 5.198658419 + 5.32222222 Combine like terms: 5.198658419 + 5.32222222 = 10.520880639 x = 10.520880639 Simplifying x = 10.520880639

Subproblem 2

x + -5.32222222 = -5.198658419 Simplifying x + -5.32222222 = -5.198658419 Reorder the terms: -5.32222222 + x = -5.198658419 Solving -5.32222222 + x = -5.198658419 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.32222222' to each side of the equation. -5.32222222 + 5.32222222 + x = -5.198658419 + 5.32222222 Combine like terms: -5.32222222 + 5.32222222 = 0.00000000 0.00000000 + x = -5.198658419 + 5.32222222 x = -5.198658419 + 5.32222222 Combine like terms: -5.198658419 + 5.32222222 = 0.123563801 x = 0.123563801 Simplifying x = 0.123563801

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.520880639, 0.123563801}

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