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3=18-a/8
We move all terms to the left:
3-(18-a/8)=0
We add all the numbers together, and all the variables
-(-a/8+18)+3=0
We get rid of parentheses
a/8-18+3=0
We multiply all the terms by the denominator
a-18*8+3*8=0
We add all the numbers together, and all the variables
a-120=0
We move all terms containing a to the left, all other terms to the right
a=120
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