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2r-(5-r)=13+2r
We move all terms to the left:
2r-(5-r)-(13+2r)=0
We add all the numbers together, and all the variables
2r-(-1r+5)-(2r+13)=0
We get rid of parentheses
2r+1r-2r-5-13=0
We add all the numbers together, and all the variables
r-18=0
We move all terms containing r to the left, all other terms to the right
r=18
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