-12=72-4x-90+6x

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Solution for -12=72-4x-90+6x equation:


Simplifying
-12 = 72 + -4x + -90 + 6x

Reorder the terms:
-12 = 72 + -90 + -4x + 6x

Combine like terms: 72 + -90 = -18
-12 = -18 + -4x + 6x

Combine like terms: -4x + 6x = 2x
-12 = -18 + 2x

Solving
-12 = -18 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
-12 + -2x = -18 + 2x + -2x

Combine like terms: 2x + -2x = 0
-12 + -2x = -18 + 0
-12 + -2x = -18

Add '12' to each side of the equation.
-12 + 12 + -2x = -18 + 12

Combine like terms: -12 + 12 = 0
0 + -2x = -18 + 12
-2x = -18 + 12

Combine like terms: -18 + 12 = -6
-2x = -6

Divide each side by '-2'.
x = 3

Simplifying
x = 3

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