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-3(r+5)=56
We move all terms to the left:
-3(r+5)-(56)=0
We multiply parentheses
-3r-15-56=0
We add all the numbers together, and all the variables
-3r-71=0
We move all terms containing r to the left, all other terms to the right
-3r=71
r=71/-3
r=-23+2/3
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