-5a+20+8a=7a-9a

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Solution for -5a+20+8a=7a-9a equation:


Simplifying
-5a + 20 + 8a = 7a + -9a

Reorder the terms:
20 + -5a + 8a = 7a + -9a

Combine like terms: -5a + 8a = 3a
20 + 3a = 7a + -9a

Combine like terms: 7a + -9a = -2a
20 + 3a = -2a

Solving
20 + 3a = -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.
20 + 3a + 2a = -2a + 2a

Combine like terms: 3a + 2a = 5a
20 + 5a = -2a + 2a

Combine like terms: -2a + 2a = 0
20 + 5a = 0

Add '-20' to each side of the equation.
20 + -20 + 5a = 0 + -20

Combine like terms: 20 + -20 = 0
0 + 5a = 0 + -20
5a = 0 + -20

Combine like terms: 0 + -20 = -20
5a = -20

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

Simplifying
a = -4

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