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a/5-3=12
We move all terms to the left:
a/5-3-(12)=0
We add all the numbers together, and all the variables
a/5-15=0
We multiply all the terms by the denominator
a-15*5=0
We add all the numbers together, and all the variables
a-75=0
We move all terms containing a to the left, all other terms to the right
a=75
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