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-5(r+9)=76
We move all terms to the left:
-5(r+9)-(76)=0
We multiply parentheses
-5r-45-76=0
We add all the numbers together, and all the variables
-5r-121=0
We move all terms containing r to the left, all other terms to the right
-5r=121
r=121/-5
r=-24+1/5
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