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1=5-r
We move all terms to the left:
1-(5-r)=0
We add all the numbers together, and all the variables
-(-1r+5)+1=0
We get rid of parentheses
1r-5+1=0
We add all the numbers together, and all the variables
r-4=0
We move all terms containing r to the left, all other terms to the right
r=4
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