9a-31=89-a

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Solution for 9a-31=89-a equation:


Simplifying
9a + -31 = 89 + -1a

Reorder the terms:
-31 + 9a = 89 + -1a

Solving
-31 + 9a = 89 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
-31 + 9a + a = 89 + -1a + a

Combine like terms: 9a + a = 10a
-31 + 10a = 89 + -1a + a

Combine like terms: -1a + a = 0
-31 + 10a = 89 + 0
-31 + 10a = 89

Add '31' to each side of the equation.
-31 + 31 + 10a = 89 + 31

Combine like terms: -31 + 31 = 0
0 + 10a = 89 + 31
10a = 89 + 31

Combine like terms: 89 + 31 = 120
10a = 120

Divide each side by '10'.
a = 12

Simplifying
a = 12

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