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7=5-2r
We move all terms to the left:
7-(5-2r)=0
We add all the numbers together, and all the variables
-(-2r+5)+7=0
We get rid of parentheses
2r-5+7=0
We add all the numbers together, and all the variables
2r+2=0
We move all terms containing r to the left, all other terms to the right
2r=-2
r=-2/2
r=-1
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