2a+a-9=30

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Solution for 2a+a-9=30 equation: 


Simplifying
2a + a + -9 = 30

Reorder the terms:
-9 + 2a + a = 30

Combine like terms: 2a + a = 3a
-9 + 3a = 30

Solving
-9 + 3a = 30

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 = 30 + 9

Combine like terms: -9 + 9 = 0
0 + 3a = 30 + 9
3a = 30 + 9

Combine like terms: 30 + 9 = 39
3a = 39

Divide each side by '3'.
a = 13

Simplifying
a = 13

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