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5(3r+5)+2(r+4)=50
We move all terms to the left:
5(3r+5)+2(r+4)-(50)=0
We multiply parentheses
15r+2r+25+8-50=0
We add all the numbers together, and all the variables
17r-17=0
We move all terms containing r to the left, all other terms to the right
17r=17
r=17/17
r=1
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