4x-84=72-9x

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Solution for 4x-84=72-9x equation:


Simplifying
4x + -84 = 72 + -9x

Reorder the terms:
-84 + 4x = 72 + -9x

Solving
-84 + 4x = 72 + -9x

Solving for variable 'x'.

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

Add '9x' to each side of the equation.
-84 + 4x + 9x = 72 + -9x + 9x

Combine like terms: 4x + 9x = 13x
-84 + 13x = 72 + -9x + 9x

Combine like terms: -9x + 9x = 0
-84 + 13x = 72 + 0
-84 + 13x = 72

Add '84' to each side of the equation.
-84 + 84 + 13x = 72 + 84

Combine like terms: -84 + 84 = 0
0 + 13x = 72 + 84
13x = 72 + 84

Combine like terms: 72 + 84 = 156
13x = 156

Divide each side by '13'.
x = 12

Simplifying
x = 12

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