7-2y=21-6y

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Solution for 7-2y=21-6y equation: 



7-2y=21-6y

We move all terms to the left:

7-2y-(21-6y)=0

We add all the numbers together, and all the variables

-2y-(-6y+21)+7=0

We get rid of parentheses

-2y+6y-21+7=0

We add all the numbers together, and all the variables

4y-14=0

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

4y=14

y=14/4

y=3+1/2

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