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-5r+5(5r+3)=8r+39
We move all terms to the left:
-5r+5(5r+3)-(8r+39)=0
We multiply parentheses
-5r+25r-(8r+39)+15=0
We get rid of parentheses
-5r+25r-8r-39+15=0
We add all the numbers together, and all the variables
12r-24=0
We move all terms containing r to the left, all other terms to the right
12r=24
r=24/12
r=2
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