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31=x/5+15
We move all terms to the left:
31-(x/5+15)=0
We get rid of parentheses
-x/5-15+31=0
We multiply all the terms by the denominator
-x-15*5+31*5=0
We add all the numbers together, and all the variables
-1x+80=0
We move all terms containing x to the left, all other terms to the right
-x=-80
x=-80/-1
x=+80
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