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5(3r+11)=85.
We move all terms to the left:
5(3r+11)-(85.)=0
We add all the numbers together, and all the variables
5(3r+11)-85=0
We multiply parentheses
15r+55-85=0
We add all the numbers together, and all the variables
15r-30=0
We move all terms containing r to the left, all other terms to the right
15r=30
r=30/15
r=2
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