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r+21/6=28/6
We move all terms to the left:
r+21/6-(28/6)=0
We add all the numbers together, and all the variables
r+21/6-(+28/6)=0
We get rid of parentheses
r+21/6-28/6=0
We multiply all the terms by the denominator
r*6+21-28=0
We add all the numbers together, and all the variables
r*6-7=0
Wy multiply elements
6r-7=0
We move all terms containing r to the left, all other terms to the right
6r=7
r=7/6
r=1+1/6
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