5+3y=7y+21

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



5+3y=7y+21

We move all terms to the left:

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

We get rid of parentheses

3y-7y-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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