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(12a)+(6a+8)+(6a+8)+(10a+4)=102
We move all terms to the left:
(12a)+(6a+8)+(6a+8)+(10a+4)-(102)=0
We get rid of parentheses
12a+6a+6a+10a+8+8+4-102=0
We add all the numbers together, and all the variables
34a-82=0
We move all terms containing a to the left, all other terms to the right
34a=82
a=82/34
a=2+7/17
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