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a/3-15=15
We move all terms to the left:
a/3-15-(15)=0
We add all the numbers together, and all the variables
a/3-30=0
We multiply all the terms by the denominator
a-30*3=0
We add all the numbers together, and all the variables
a-90=0
We move all terms containing a to the left, all other terms to the right
a=90
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