10x-15=5(x+81)

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Solution for 10x-15=5(x+81) equation:


Simplifying
10x + -15 = 5(x + 81)

Reorder the terms:
-15 + 10x = 5(x + 81)

Reorder the terms:
-15 + 10x = 5(81 + x)
-15 + 10x = (81 * 5 + x * 5)
-15 + 10x = (405 + 5x)

Solving
-15 + 10x = 405 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
-15 + 10x + -5x = 405 + 5x + -5x

Combine like terms: 10x + -5x = 5x
-15 + 5x = 405 + 5x + -5x

Combine like terms: 5x + -5x = 0
-15 + 5x = 405 + 0
-15 + 5x = 405

Add '15' to each side of the equation.
-15 + 15 + 5x = 405 + 15

Combine like terms: -15 + 15 = 0
0 + 5x = 405 + 15
5x = 405 + 15

Combine like terms: 405 + 15 = 420
5x = 420

Divide each side by '5'.
x = 84

Simplifying
x = 84

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