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

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


Simplifying
7x + -2(-1x + 9) = -90

Reorder the terms:
7x + -2(9 + -1x) = -90
7x + (9 * -2 + -1x * -2) = -90
7x + (-18 + 2x) = -90

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

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

Solving
-18 + 9x = -90

Solving for variable 'x'.

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

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

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

Combine like terms: -90 + 18 = -72
9x = -72

Divide each side by '9'.
x = -8

Simplifying
x = -8

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