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10(r-92)=80
We move all terms to the left:
10(r-92)-(80)=0
We multiply parentheses
10r-920-80=0
We add all the numbers together, and all the variables
10r-1000=0
We move all terms containing r to the left, all other terms to the right
10r=1000
r=1000/10
r=100
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