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1=3-r
We move all terms to the left:
1-(3-r)=0
We add all the numbers together, and all the variables
-(-1r+3)+1=0
We get rid of parentheses
1r-3+1=0
We add all the numbers together, and all the variables
r-2=0
We move all terms containing r to the left, all other terms to the right
r=2
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