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-3(r+5)+5r=r-20
We move all terms to the left:
-3(r+5)+5r-(r-20)=0
We add all the numbers together, and all the variables
5r-3(r+5)-(r-20)=0
We multiply parentheses
5r-3r-(r-20)-15=0
We get rid of parentheses
5r-3r-r+20-15=0
We add all the numbers together, and all the variables
r+5=0
We move all terms containing r to the left, all other terms to the right
r=-5
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