7y+5=3y+21

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Solution for 7y+5=3y+21 equation: 



7y+5=3y+21

We move all terms to the left:

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

We get rid of parentheses

7y-3y-21+5=0

We add all the numbers together, and all the variables

4y-16=0

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

4y=16

y=16/4

y=4

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