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4(r-1)+3(6r+2)=13
We move all terms to the left:
4(r-1)+3(6r+2)-(13)=0
We multiply parentheses
4r+18r-4+6-13=0
We add all the numbers together, and all the variables
22r-11=0
We move all terms containing r to the left, all other terms to the right
22r=11
r=11/22
r=1/2
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