90=2x+(x-15)2

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Solution for 90=2x+(x-15)2 equation: 


Simplifying
90 = 2x + (x + -15) * 2

Reorder the terms:
90 = 2x + (-15 + x) * 2

Reorder the terms for easier multiplication:
90 = 2x + 2(-15 + x)
90 = 2x + (-15 * 2 + x * 2)
90 = 2x + (-30 + 2x)

Reorder the terms:
90 = -30 + 2x + 2x

Combine like terms: 2x + 2x = 4x
90 = -30 + 4x

Solving
90 = -30 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
90 + -4x = -30 + 4x + -4x

Combine like terms: 4x + -4x = 0
90 + -4x = -30 + 0
90 + -4x = -30

Add '-90' to each side of the equation.
90 + -90 + -4x = -30 + -90

Combine like terms: 90 + -90 = 0
0 + -4x = -30 + -90
-4x = -30 + -90

Combine like terms: -30 + -90 = -120
-4x = -120

Divide each side by '-4'.
x = 30

Simplifying
x = 30

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