12+7a=2a-8

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Solution for 12+7a=2a-8 equation:


Simplifying
12 + 7a = 2a + -8

Reorder the terms:
12 + 7a = -8 + 2a

Solving
12 + 7a = -8 + 2a

Solving for variable 'a'.

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

Add '-2a' to each side of the equation.
12 + 7a + -2a = -8 + 2a + -2a

Combine like terms: 7a + -2a = 5a
12 + 5a = -8 + 2a + -2a

Combine like terms: 2a + -2a = 0
12 + 5a = -8 + 0
12 + 5a = -8

Add '-12' to each side of the equation.
12 + -12 + 5a = -8 + -12

Combine like terms: 12 + -12 = 0
0 + 5a = -8 + -12
5a = -8 + -12

Combine like terms: -8 + -12 = -20
5a = -20

Divide each side by '5'.
a = -4

Simplifying
a = -4

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