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a/2-5=15
We move all terms to the left:
a/2-5-(15)=0
We add all the numbers together, and all the variables
a/2-20=0
We multiply all the terms by the denominator
a-20*2=0
We add all the numbers together, and all the variables
a-40=0
We move all terms containing a to the left, all other terms to the right
a=40
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