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5r+45-2(1-r)=1
We move all terms to the left:
5r+45-2(1-r)-(1)=0
We add all the numbers together, and all the variables
5r-2(-1r+1)+45-1=0
We add all the numbers together, and all the variables
5r-2(-1r+1)+44=0
We multiply parentheses
5r+2r-2+44=0
We add all the numbers together, and all the variables
7r+42=0
We move all terms containing r to the left, all other terms to the right
7r=-42
r=-42/7
r=-6
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