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6(3+4r)=30
We move all terms to the left:
6(3+4r)-(30)=0
We add all the numbers together, and all the variables
6(4r+3)-30=0
We multiply parentheses
24r+18-30=0
We add all the numbers together, and all the variables
24r-12=0
We move all terms containing r to the left, all other terms to the right
24r=12
r=12/24
r=1/2
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