7a+2a=135

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Solution for 7a+2a=135 equation: 



7a+2a=135

We move all terms to the left:

7a+2a-(135)=0

We add all the numbers together, and all the variables

9a-135=0

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

9a=135

a=135/9

a=15

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