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8=r/5+10
We move all terms to the left:
8-(r/5+10)=0
We get rid of parentheses
-r/5-10+8=0
We multiply all the terms by the denominator
-r-10*5+8*5=0
We add all the numbers together, and all the variables
-1r-10=0
We move all terms containing r to the left, all other terms to the right
-r=10
r=10/-1
r=-10
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