-7a+5+8a=12-21

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Solution for -7a+5+8a=12-21 equation:


Simplifying
-7a + 5 + 8a = 12 + -21

Reorder the terms:
5 + -7a + 8a = 12 + -21

Combine like terms: -7a + 8a = 1a
5 + 1a = 12 + -21

Combine like terms: 12 + -21 = -9
5 + 1a = -9

Solving
5 + 1a = -9

Solving for variable 'a'.

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

Add '-5' to each side of the equation.
5 + -5 + 1a = -9 + -5

Combine like terms: 5 + -5 = 0
0 + 1a = -9 + -5
1a = -9 + -5

Combine like terms: -9 + -5 = -14
1a = -14

Divide each side by '1'.
a = -14

Simplifying
a = -14

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