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-5=10+5r
We move all terms to the left:
-5-(10+5r)=0
We add all the numbers together, and all the variables
-(5r+10)-5=0
We get rid of parentheses
-5r-10-5=0
We add all the numbers together, and all the variables
-5r-15=0
We move all terms containing r to the left, all other terms to the right
-5r=15
r=15/-5
r=-3
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