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(4a)+(2a+12)+(66)=180
We move all terms to the left:
(4a)+(2a+12)+(66)-(180)=0
We add all the numbers together, and all the variables
4a+(2a+12)-114=0
We get rid of parentheses
4a+2a+12-114=0
We add all the numbers together, and all the variables
6a-102=0
We move all terms containing a to the left, all other terms to the right
6a=102
a=102/6
a=17
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