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3y-(y+4)=4y-8

We move all terms to the left:

3y-(y+4)-(4y-8)=0

We get rid of parentheses

3y-y-4y-4+8=0

We add all the numbers together, and all the variables

-2y+4=0

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

-2y=-4

y=-4/-2

y=+2

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