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2(1-r)=4r-22
We move all terms to the left:
2(1-r)-(4r-22)=0
We add all the numbers together, and all the variables
2(-1r+1)-(4r-22)=0
We multiply parentheses
-2r-(4r-22)+2=0
We get rid of parentheses
-2r-4r+22+2=0
We add all the numbers together, and all the variables
-6r+24=0
We move all terms containing r to the left, all other terms to the right
-6r=-24
r=-24/-6
r=+4
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