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(4a+51)+(2a+27)=180
We move all terms to the left:
(4a+51)+(2a+27)-(180)=0
We get rid of parentheses
4a+2a+51+27-180=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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