2a+7a=180

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Solution for 2a+7a=180 equation: 



2a+7a=180

We move all terms to the left:

2a+7a-(180)=0

We add all the numbers together, and all the variables

9a-180=0

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

9a=180

a=180/9

a=20

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