2a-a+9=3a-9

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Solution for 2a-a+9=3a-9 equation: 



2a-a+9=3a-9

We move all terms to the left:

2a-a+9-(3a-9)=0

We add all the numbers together, and all the variables

a-(3a-9)+9=0

We get rid of parentheses

a-3a+9+9=0

We add all the numbers together, and all the variables

-2a+18=0

We move all terms containing a to the left, all other terms to the right

-2a=-18

a=-18/-2

a=+9

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