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3(7r-2)=21r=6
We move all terms to the left:
3(7r-2)-(21r)=0
We add all the numbers together, and all the variables
-21r+3(7r-2)=0
We multiply parentheses
-21r+21r-6=0
We add all the numbers together, and all the variables
-6!=0
There is no solution for this equation
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