2a+7a=7

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Solution for 2a+7a=7 equation: 



2a+7a=7

We move all terms to the left:

2a+7a-(7)=0

We add all the numbers together, and all the variables

9a-7=0

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

9a=7

a=7/9

a=7/9

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