4*(90-x)-15=x

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Solution for 4*(90-x)-15=x equation: 


Simplifying
4(90 + -1x) + -15 = x
(90 * 4 + -1x * 4) + -15 = x
(360 + -4x) + -15 = x

Reorder the terms:
360 + -15 + -4x = x

Combine like terms: 360 + -15 = 345
345 + -4x = x

Solving
345 + -4x = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
345 + -4x + -1x = x + -1x

Combine like terms: -4x + -1x = -5x
345 + -5x = x + -1x

Combine like terms: x + -1x = 0
345 + -5x = 0

Add '-345' to each side of the equation.
345 + -345 + -5x = 0 + -345

Combine like terms: 345 + -345 = 0
0 + -5x = 0 + -345
-5x = 0 + -345

Combine like terms: 0 + -345 = -345
-5x = -345

Divide each side by '-5'.
x = 69

Simplifying
x = 69

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