3y+5=7y-15

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Solution for 3y+5=7y-15 equation: 



3y+5=7y-15

We move all terms to the left:

3y+5-(7y-15)=0

We get rid of parentheses

3y-7y+15+5=0

We add all the numbers together, and all the variables

-4y+20=0

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

-4y=-20

y=-20/-4

y=+5

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