-2a+20+9a=5a-8a

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Solution for -2a+20+9a=5a-8a equation:


Simplifying
-2a + 20 + 9a = 5a + -8a

Reorder the terms:
20 + -2a + 9a = 5a + -8a

Combine like terms: -2a + 9a = 7a
20 + 7a = 5a + -8a

Combine like terms: 5a + -8a = -3a
20 + 7a = -3a

Solving
20 + 7a = -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
20 + 7a + 3a = -3a + 3a

Combine like terms: 7a + 3a = 10a
20 + 10a = -3a + 3a

Combine like terms: -3a + 3a = 0
20 + 10a = 0

Add '-20' to each side of the equation.
20 + -20 + 10a = 0 + -20

Combine like terms: 20 + -20 = 0
0 + 10a = 0 + -20
10a = 0 + -20

Combine like terms: 0 + -20 = -20
10a = -20

Divide each side by '10'.
a = -2

Simplifying
a = -2

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