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3(r-1)+2(3r=5)=
We move all terms to the left:
3(r-1)+2(3r-(5))=0
We multiply parentheses
3r+6r-3-10=0
We add all the numbers together, and all the variables
9r-13=0
We move all terms containing r to the left, all other terms to the right
9r=13
r=13/9
r=1+4/9
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