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-112=6r-4
We move all terms to the left:
-112-(6r-4)=0
We get rid of parentheses
-6r+4-112=0
We add all the numbers together, and all the variables
-6r-108=0
We move all terms containing r to the left, all other terms to the right
-6r=108
r=108/-6
r=-18
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