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9(8+r)=81
We move all terms to the left:
9(8+r)-(81)=0
We add all the numbers together, and all the variables
9(r+8)-81=0
We multiply parentheses
9r+72-81=0
We add all the numbers together, and all the variables
9r-9=0
We move all terms containing r to the left, all other terms to the right
9r=9
r=9/9
r=1
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