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11=7r-3
We move all terms to the left:
11-(7r-3)=0
We get rid of parentheses
-7r+3+11=0
We add all the numbers together, and all the variables
-7r+14=0
We move all terms containing r to the left, all other terms to the right
-7r=-14
r=-14/-7
r=+2
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