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-10=-5r-25
We move all terms to the left:
-10-(-5r-25)=0
We get rid of parentheses
5r+25-10=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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