78=-9x-3(-56)+12x

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Solution for 78=-9x-3(-56)+12x equation: 


Simplifying
78 = -9x + -3(-56) + 12x

Multiply -3 * -56
78 = -9x + 168 + 12x

Reorder the terms:
78 = 168 + -9x + 12x

Combine like terms: -9x + 12x = 3x
78 = 168 + 3x

Solving
78 = 168 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
78 + -3x = 168 + 3x + -3x

Combine like terms: 3x + -3x = 0
78 + -3x = 168 + 0
78 + -3x = 168

Add '-78' to each side of the equation.
78 + -78 + -3x = 168 + -78

Combine like terms: 78 + -78 = 0
0 + -3x = 168 + -78
-3x = 168 + -78

Combine like terms: 168 + -78 = 90
-3x = 90

Divide each side by '-3'.
x = -30

Simplifying
x = -30

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