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5(r-1)+4(r-2)=75
We move all terms to the left:
5(r-1)+4(r-2)-(75)=0
We multiply parentheses
5r+4r-5-8-75=0
We add all the numbers together, and all the variables
9r-88=0
We move all terms containing r to the left, all other terms to the right
9r=88
r=88/9
r=9+7/9
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