3=y-18

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Solution for 3=y-18 equation: 



3=y-18

We move all terms to the left:

3-(y-18)=0

We get rid of parentheses

-y+18+3=0

We add all the numbers together, and all the variables

-1y+21=0

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

-y=-21

y=-21/-1

y=+21

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