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-4(r+2)=-57
We move all terms to the left:
-4(r+2)-(-57)=0
We add all the numbers together, and all the variables
-4(r+2)+57=0
We multiply parentheses
-4r-8+57=0
We add all the numbers together, and all the variables
-4r+49=0
We move all terms containing r to the left, all other terms to the right
-4r=-49
r=-49/-4
r=12+1/4
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