-3y+21-1=y+4

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Solution for -3y+21-1=y+4 equation: 



-3y+21-1=y+4

We move all terms to the left:

-3y+21-1-(y+4)=0

We add all the numbers together, and all the variables

-3y-(y+4)+20=0

We get rid of parentheses

-3y-y-4+20=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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