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20=a/12+14
We move all terms to the left:
20-(a/12+14)=0
We get rid of parentheses
-a/12-14+20=0
We multiply all the terms by the denominator
-a-14*12+20*12=0
We add all the numbers together, and all the variables
-1a+72=0
We move all terms containing a to the left, all other terms to the right
-a=-72
a=-72/-1
a=+72
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