-21=y+18

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Solution for -21=y+18 equation: 



-21=y+18

We move all terms to the left:

-21-(y+18)=0

We get rid of parentheses

-y-18-21=0

We add all the numbers together, and all the variables

-1y-39=0

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

-y=39

y=39/-1

y=-39

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