-18=3-7y

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Solution for -18=3-7y equation: 



-18=3-7y

We move all terms to the left:

-18-(3-7y)=0

We add all the numbers together, and all the variables

-(-7y+3)-18=0

We get rid of parentheses

7y-3-18=0

We add all the numbers together, and all the variables

7y-21=0

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

7y=21

y=21/7

y=3

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