40-4x=12

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Solution for 40-4x=12 equation: 


Simplifying
40 + -4x = 12

Solving
40 + -4x = 12

Solving for variable 'x'.

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

Add '-40' to each side of the equation.
40 + -40 + -4x = 12 + -40

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

Combine like terms: 12 + -40 = -28
-4x = -28

Divide each side by '-4'.
x = 7

Simplifying
x = 7

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