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-10(r+12)-7(r+1)=-110
We move all terms to the left:
-10(r+12)-7(r+1)-(-110)=0
We add all the numbers together, and all the variables
-10(r+12)-7(r+1)+110=0
We multiply parentheses
-10r-7r-120-7+110=0
We add all the numbers together, and all the variables
-17r-17=0
We move all terms containing r to the left, all other terms to the right
-17r=17
r=17/-17
r=-1
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