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-5(r+4)=71
We move all terms to the left:
-5(r+4)-(71)=0
We multiply parentheses
-5r-20-71=0
We add all the numbers together, and all the variables
-5r-91=0
We move all terms containing r to the left, all other terms to the right
-5r=91
r=91/-5
r=-18+1/5
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