y=3-21

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Solution for y=3-21 equation: 



y=3-21

We move all terms to the left:

y-(3-21)=0

We add all the numbers together, and all the variables

y-(-18)=0

We add all the numbers together, and all the variables

y+18=0

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

y=-18

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