3(7r-2)=21

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Solution for 3(7r-2)=21 equation: 



3(7r-2)=21

We move all terms to the left:

3(7r-2)-(21)=0

We multiply parentheses

21r-6-21=0

We add all the numbers together, and all the variables

21r-27=0

We move all terms containing r to the left, all other terms to the right

21r=27

r=27/21

r=1+2/7

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