y+3-4y=21

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



y+3-4y=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3y-18=0

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

-3y=18

y=18/-3

y=-6

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