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-28=r/7-25
We move all terms to the left:
-28-(r/7-25)=0
We get rid of parentheses
-r/7+25-28=0
We multiply all the terms by the denominator
-r+25*7-28*7=0
We add all the numbers together, and all the variables
-1r-21=0
We move all terms containing r to the left, all other terms to the right
-r=21
r=21/-1
r=-21
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