257=78-y

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Solution for 257=78-y equation: 



257=78-y

We move all terms to the left:

257-(78-y)=0

We add all the numbers together, and all the variables

-(-1y+78)+257=0

We get rid of parentheses

1y-78+257=0

We add all the numbers together, and all the variables

y+179=0

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

y=-179

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