28=40-u

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Solution for 28=40-u equation: 



28=40-u

We move all terms to the left:

28-(40-u)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1u-40+28=0

We add all the numbers together, and all the variables

u-12=0

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

u=12

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