2a-9+a=90

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Solution for 2a-9+a=90 equation: 


Simplifying
2a + -9 + a = 90

Reorder the terms:
-9 + 2a + a = 90

Combine like terms: 2a + a = 3a
-9 + 3a = 90

Solving
-9 + 3a = 90

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 3a = 90 + 9

Combine like terms: -9 + 9 = 0
0 + 3a = 90 + 9
3a = 90 + 9

Combine like terms: 90 + 9 = 99
3a = 99

Divide each side by '3'.
a = 33

Simplifying
a = 33

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