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3(2r+5)=16
We move all terms to the left:
3(2r+5)-(16)=0
We multiply parentheses
6r+15-16=0
We add all the numbers together, and all the variables
6r-1=0
We move all terms containing r to the left, all other terms to the right
6r=1
r=1/6
r=1/6
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