9a-1=89

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Solution for 9a-1=89 equation: 


Simplifying
9a + -1 = 89

Reorder the terms:
-1 + 9a = 89

Solving
-1 + 9a = 89

Solving for variable 'a'.

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

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

Combine like terms: -1 + 1 = 0
0 + 9a = 89 + 1
9a = 89 + 1

Combine like terms: 89 + 1 = 90
9a = 90

Divide each side by '9'.
a = 10

Simplifying
a = 10

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