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-5=1-2r
We move all terms to the left:
-5-(1-2r)=0
We add all the numbers together, and all the variables
-(-2r+1)-5=0
We get rid of parentheses
2r-1-5=0
We add all the numbers together, and all the variables
2r-6=0
We move all terms containing r to the left, all other terms to the right
2r=6
r=6/2
r=3
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