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20=12a+60
We move all terms to the left:
20-(12a+60)=0
We get rid of parentheses
-12a-60+20=0
We add all the numbers together, and all the variables
-12a-40=0
We move all terms containing a to the left, all other terms to the right
-12a=40
a=40/-12
a=-3+1/3
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