7y-21=2y-18+2y

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Solution for 7y-21=2y-18+2y equation: 



7y-21=2y-18+2y

We move all terms to the left:

7y-21-(2y-18+2y)=0

We add all the numbers together, and all the variables

7y-(4y-18)-21=0

We get rid of parentheses

7y-4y+18-21=0

We add all the numbers together, and all the variables

3y-3=0

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

3y=3

y=3/3

y=1

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