7a+a-7a+2a=12

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Solution for 7a+a-7a+2a=12 equation: 



7a+a-7a+2a=12

We move all terms to the left:

7a+a-7a+2a-(12)=0

We add all the numbers together, and all the variables

3a-12=0

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

3a=12

a=12/3

a=4

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