3(5r+7)=21+3r

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Solution for 3(5r+7)=21+3r equation: 



3(5r+7)=21+3r

We move all terms to the left:

3(5r+7)-(21+3r)=0

We add all the numbers together, and all the variables

3(5r+7)-(3r+21)=0

We multiply parentheses

15r-(3r+21)+21=0

We get rid of parentheses

15r-3r-21+21=0

We add all the numbers together, and all the variables

12r=0

r=0/12

r=0

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