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-10=r/15
We move all terms to the left:
-10-(r/15)=0
We add all the numbers together, and all the variables
-(+r/15)-10=0
We get rid of parentheses
-r/15-10=0
We multiply all the terms by the denominator
-r-10*15=0
We add all the numbers together, and all the variables
-1r-150=0
We move all terms containing r to the left, all other terms to the right
-r=150
r=150/-1
r=-150
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