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25=5r-10
We move all terms to the left:
25-(5r-10)=0
We get rid of parentheses
-5r+10+25=0
We add all the numbers together, and all the variables
-5r+35=0
We move all terms containing r to the left, all other terms to the right
-5r=-35
r=-35/-5
r=+7
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