7y-21=y-3

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Solution for 7y-21=y-3 equation: 



7y-21=y-3

We move all terms to the left:

7y-21-(y-3)=0

We get rid of parentheses

7y-y+3-21=0

We add all the numbers together, and all the variables

6y-18=0

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

6y=18

y=18/6

y=3

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