90=7x+2(x-9)

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Solution for 90=7x+2(x-9) equation:


Simplifying
90 = 7x + 2(x + -9)

Reorder the terms:
90 = 7x + 2(-9 + x)
90 = 7x + (-9 * 2 + x * 2)
90 = 7x + (-18 + 2x)

Reorder the terms:
90 = -18 + 7x + 2x

Combine like terms: 7x + 2x = 9x
90 = -18 + 9x

Solving
90 = -18 + 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.
90 + -9x = -18 + 9x + -9x

Combine like terms: 9x + -9x = 0
90 + -9x = -18 + 0
90 + -9x = -18

Add '-90' to each side of the equation.
90 + -90 + -9x = -18 + -90

Combine like terms: 90 + -90 = 0
0 + -9x = -18 + -90
-9x = -18 + -90

Combine like terms: -18 + -90 = -108
-9x = -108

Divide each side by '-9'.
x = 12

Simplifying
x = 12

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