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6(4r-3)=30
We move all terms to the left:
6(4r-3)-(30)=0
We multiply parentheses
24r-18-30=0
We add all the numbers together, and all the variables
24r-48=0
We move all terms containing r to the left, all other terms to the right
24r=48
r=48/24
r=2
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