20=9a+8-15a

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Solution for 20=9a+8-15a equation:


Simplifying
20 = 9a + 8 + -15a

Reorder the terms:
20 = 8 + 9a + -15a

Combine like terms: 9a + -15a = -6a
20 = 8 + -6a

Solving
20 = 8 + -6a

Solving for variable 'a'.

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

Add '6a' to each side of the equation.
20 + 6a = 8 + -6a + 6a

Combine like terms: -6a + 6a = 0
20 + 6a = 8 + 0
20 + 6a = 8

Add '-20' to each side of the equation.
20 + -20 + 6a = 8 + -20

Combine like terms: 20 + -20 = 0
0 + 6a = 8 + -20
6a = 8 + -20

Combine like terms: 8 + -20 = -12
6a = -12

Divide each side by '6'.
a = -2

Simplifying
a = -2

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