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(4a-12)+12a=180
We move all terms to the left:
(4a-12)+12a-(180)=0
We add all the numbers together, and all the variables
12a+(4a-12)-180=0
We get rid of parentheses
12a+4a-12-180=0
We add all the numbers together, and all the variables
16a-192=0
We move all terms containing a to the left, all other terms to the right
16a=192
a=192/16
a=12
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