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7(1-3r)=91
We move all terms to the left:
7(1-3r)-(91)=0
We add all the numbers together, and all the variables
7(-3r+1)-91=0
We multiply parentheses
-21r+7-91=0
We add all the numbers together, and all the variables
-21r-84=0
We move all terms containing r to the left, all other terms to the right
-21r=84
r=84/-21
r=-4
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