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12=a/15
We move all terms to the left:
12-(a/15)=0
We add all the numbers together, and all the variables
-(+a/15)+12=0
We get rid of parentheses
-a/15+12=0
We multiply all the terms by the denominator
-a+12*15=0
We add all the numbers together, and all the variables
-1a+180=0
We move all terms containing a to the left, all other terms to the right
-a=-180
a=-180/-1
a=+180
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