12+5x=-78

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Solution for 12+5x=-78 equation: 


Simplifying
12 + 5x = -78

Solving
12 + 5x = -78

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 5x = -78 + -12

Combine like terms: 12 + -12 = 0
0 + 5x = -78 + -12
5x = -78 + -12

Combine like terms: -78 + -12 = -90
5x = -90

Divide each side by '5'.
x = -18

Simplifying
x = -18

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