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25=11+r
We move all terms to the left:
25-(11+r)=0
We add all the numbers together, and all the variables
-(r+11)+25=0
We get rid of parentheses
-r-11+25=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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