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-5-5(-4r-1)=80
We move all terms to the left:
-5-5(-4r-1)-(80)=0
We add all the numbers together, and all the variables
-5(-4r-1)-85=0
We multiply parentheses
20r+5-85=0
We add all the numbers together, and all the variables
20r-80=0
We move all terms containing r to the left, all other terms to the right
20r=80
r=80/20
r=4
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