40=12-7a

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Solution for 40=12-7a equation:


Simplifying
40 = 12 + -7a

Solving
40 = 12 + -7a

Solving for variable 'a'.

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

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

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

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

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

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

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

Simplifying
a = -4

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