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5(r+9)-2(1-r)=-r+43+8r
We move all terms to the left:
5(r+9)-2(1-r)-(-r+43+8r)=0
We add all the numbers together, and all the variables
5(r+9)-2(-1r+1)-(7r+43)=0
We multiply parentheses
5r+2r-(7r+43)+45-2=0
We get rid of parentheses
5r+2r-7r-43+45-2=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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