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(r/3)+2r=7
We move all terms to the left:
(r/3)+2r-(7)=0
We add all the numbers together, and all the variables
(+r/3)+2r-7=0
We add all the numbers together, and all the variables
2r+(+r/3)-7=0
We get rid of parentheses
2r+r/3-7=0
We multiply all the terms by the denominator
2r*3+r-7*3=0
We add all the numbers together, and all the variables
r+2r*3-21=0
Wy multiply elements
r+6r-21=0
We add all the numbers together, and all the variables
7r-21=0
We move all terms containing r to the left, all other terms to the right
7r=21
r=21/7
r=3
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