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2(r+4)-3(r+1)=11
We move all terms to the left:
2(r+4)-3(r+1)-(11)=0
We multiply parentheses
2r-3r+8-3-11=0
We add all the numbers together, and all the variables
-1r-6=0
We move all terms containing r to the left, all other terms to the right
-r=6
r=6/-1
r=-6
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