y=3(2y)+y=21

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Solution for y=3(2y)+y=21 equation: 



y=3(2y)+y=21

We move all terms to the left:

y-(3(2y)+y)=0

We add all the numbers together, and all the variables

y-(+33y)=0

We get rid of parentheses

y-33y=0

We add all the numbers together, and all the variables

-32y=0

y=0/-32

y=0

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