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2(3r-4)+2(2r+1)=24
We move all terms to the left:
2(3r-4)+2(2r+1)-(24)=0
We multiply parentheses
6r+4r-8+2-24=0
We add all the numbers together, and all the variables
10r-30=0
We move all terms containing r to the left, all other terms to the right
10r=30
r=30/10
r=3
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