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43=5r-12
We move all terms to the left:
43-(5r-12)=0
We get rid of parentheses
-5r+12+43=0
We add all the numbers together, and all the variables
-5r+55=0
We move all terms containing r to the left, all other terms to the right
-5r=-55
r=-55/-5
r=+11
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