15=18-y

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Solution for 15=18-y equation: 



15=18-y

We move all terms to the left:

15-(18-y)=0

We add all the numbers together, and all the variables

-(-1y+18)+15=0

We get rid of parentheses

1y-18+15=0

We add all the numbers together, and all the variables

y-3=0

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

y=3

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