12-7n=40

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Solution for 12-7n=40 equation: 


Simplifying
12 + -7n = 40

Solving
12 + -7n = 40

Solving for variable 'n'.

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

Add '-12' to each side of the equation.
12 + -12 + -7n = 40 + -12

Combine like terms: 12 + -12 = 0
0 + -7n = 40 + -12
-7n = 40 + -12

Combine like terms: 40 + -12 = 28
-7n = 28

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

Simplifying
n = -4

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