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