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90=83+r/6
We move all terms to the left:
90-(83+r/6)=0
We add all the numbers together, and all the variables
-(r/6+83)+90=0
We get rid of parentheses
-r/6-83+90=0
We multiply all the terms by the denominator
-r-83*6+90*6=0
We add all the numbers together, and all the variables
-1r+42=0
We move all terms containing r to the left, all other terms to the right
-r=-42
r=-42/-1
r=+42
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