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-10=-5r-15
We move all terms to the left:
-10-(-5r-15)=0
We get rid of parentheses
5r+15-10=0
We add all the numbers together, and all the variables
5r+5=0
We move all terms containing r to the left, all other terms to the right
5r=-5
r=-5/5
r=-1
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