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2r-(5-r)=13+4)
We move all terms to the left:
2r-(5-r)-(13+4))=0
We add all the numbers together, and all the variables
2r-(-1r+5)-17)=0
We add all the numbers together, and all the variables
2r-(-1r+5)=0
We get rid of parentheses
2r+1r-5=0
We add all the numbers together, and all the variables
3r-5=0
We move all terms containing r to the left, all other terms to the right
3r=5
r=5/3
r=1+2/3
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