3(7r+-2)=21r+-6

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Solution for 3(7r+-2)=21r+-6 equation: 



3(7r+-2)=21r+-6

We move all terms to the left:

3(7r+-2)-(21r+-6)=0

We add all the numbers together, and all the variables

3(7r-2)-(21r-6)=0

We multiply parentheses

21r-(21r-6)-6=0

We get rid of parentheses

21r-21r+6-6=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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