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11=4-r+1
We move all terms to the left:
11-(4-r+1)=0
We add all the numbers together, and all the variables
-(-1r+5)+11=0
We get rid of parentheses
1r-5+11=0
We add all the numbers together, and all the variables
r+6=0
We move all terms containing r to the left, all other terms to the right
r=-6
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