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2r+4(1-3r)=20+3r
We move all terms to the left:
2r+4(1-3r)-(20+3r)=0
We add all the numbers together, and all the variables
2r+4(-3r+1)-(3r+20)=0
We multiply parentheses
2r-12r-(3r+20)+4=0
We get rid of parentheses
2r-12r-3r-20+4=0
We add all the numbers together, and all the variables
-13r-16=0
We move all terms containing r to the left, all other terms to the right
-13r=16
r=16/-13
r=-1+3/13
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