12-4x=-40

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Solution for 12-4x=-40 equation: 


Simplifying
12 + -4x = -40

Solving
12 + -4x = -40

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 + -4x = -40 + -12

Combine like terms: 12 + -12 = 0
0 + -4x = -40 + -12
-4x = -40 + -12

Combine like terms: -40 + -12 = -52
-4x = -52

Divide each side by '-4'.
x = 13

Simplifying
x = 13

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