28=40-y

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Solution for 28=40-y equation: 



28=40-y

We move all terms to the left:

28-(40-y)=0

We add all the numbers together, and all the variables

-(-1y+40)+28=0

We get rid of parentheses

1y-40+28=0

We add all the numbers together, and all the variables

y-12=0

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

y=12

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