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5(r+2)=2r+16
We move all terms to the left:
5(r+2)-(2r+16)=0
We multiply parentheses
5r-(2r+16)+10=0
We get rid of parentheses
5r-2r-16+10=0
We add all the numbers together, and all the variables
3r-6=0
We move all terms containing r to the left, all other terms to the right
3r=6
r=6/3
r=2
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