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-13=r/99+8
We move all terms to the left:
-13-(r/99+8)=0
We get rid of parentheses
-r/99-8-13=0
We multiply all the terms by the denominator
-r-8*99-13*99=0
We add all the numbers together, and all the variables
-1r-2079=0
We move all terms containing r to the left, all other terms to the right
-r=2079
r=2079/-1
r=-2079
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