-78=12-3x

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Solution for -78=12-3x equation:


Simplifying
-78 = 12 + -3x

Solving
-78 = 12 + -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 = 12 + -3x + 3x

Combine like terms: -3x + 3x = 0
-78 + 3x = 12 + 0
-78 + 3x = 12

Add '78' to each side of the equation.
-78 + 78 + 3x = 12 + 78

Combine like terms: -78 + 78 = 0
0 + 3x = 12 + 78
3x = 12 + 78

Combine like terms: 12 + 78 = 90
3x = 90

Divide each side by '3'.
x = 30

Simplifying
x = 30

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