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a/3+18=15
We move all terms to the left:
a/3+18-(15)=0
We add all the numbers together, and all the variables
a/3+3=0
We multiply all the terms by the denominator
a+3*3=0
We add all the numbers together, and all the variables
a+9=0
We move all terms containing a to the left, all other terms to the right
a=-9
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