7=8a+12-7a-20

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Solution for 7=8a+12-7a-20 equation:


Simplifying
7 = 8a + 12 + -7a + -20

Reorder the terms:
7 = 12 + -20 + 8a + -7a

Combine like terms: 12 + -20 = -8
7 = -8 + 8a + -7a

Combine like terms: 8a + -7a = 1a
7 = -8 + 1a

Solving
7 = -8 + 1a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
7 + -1a = -8 + 1a + -1a

Combine like terms: 1a + -1a = 0
7 + -1a = -8 + 0
7 + -1a = -8

Add '-7' to each side of the equation.
7 + -7 + -1a = -8 + -7

Combine like terms: 7 + -7 = 0
0 + -1a = -8 + -7
-1a = -8 + -7

Combine like terms: -8 + -7 = -15
-1a = -15

Divide each side by '-1'.
a = 15

Simplifying
a = 15

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