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11=4+r/2
We move all terms to the left:
11-(4+r/2)=0
We add all the numbers together, and all the variables
-(r/2+4)+11=0
We get rid of parentheses
-r/2-4+11=0
We multiply all the terms by the denominator
-r-4*2+11*2=0
We add all the numbers together, and all the variables
-1r+14=0
We move all terms containing r to the left, all other terms to the right
-r=-14
r=-14/-1
r=+14
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