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42/3=r1/3
We move all terms to the left:
42/3-(r1/3)=0
We add all the numbers together, and all the variables
-(+r1/3)+42/3=0
We add all the numbers together, and all the variables
-(+r1/3)+14=0
We get rid of parentheses
-r1/3+14=0
We multiply all the terms by the denominator
-r1+14*3=0
We add all the numbers together, and all the variables
-1r+42=0
We move all terms containing r to the left, all other terms to the right
-r=-42
r=-42/-1
r=+42
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