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-7=r/8-5
We move all terms to the left:
-7-(r/8-5)=0
We get rid of parentheses
-r/8+5-7=0
We multiply all the terms by the denominator
-r+5*8-7*8=0
We add all the numbers together, and all the variables
-1r-16=0
We move all terms containing r to the left, all other terms to the right
-r=16
r=16/-1
r=-16
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