-7a+2+8a=9-21

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Solution for -7a+2+8a=9-21 equation:


Simplifying
-7a + 2 + 8a = 9 + -21

Reorder the terms:
2 + -7a + 8a = 9 + -21

Combine like terms: -7a + 8a = 1a
2 + 1a = 9 + -21

Combine like terms: 9 + -21 = -12
2 + 1a = -12

Solving
2 + 1a = -12

Solving for variable 'a'.

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

Add '-2' to each side of the equation.
2 + -2 + 1a = -12 + -2

Combine like terms: 2 + -2 = 0
0 + 1a = -12 + -2
1a = -12 + -2

Combine like terms: -12 + -2 = -14
1a = -14

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

Simplifying
a = -14

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