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7(7+r)=84
We move all terms to the left:
7(7+r)-(84)=0
We add all the numbers together, and all the variables
7(r+7)-84=0
We multiply parentheses
7r+49-84=0
We add all the numbers together, and all the variables
7r-35=0
We move all terms containing r to the left, all other terms to the right
7r=35
r=35/7
r=5
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