-56=28-7u

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Solution for -56=28-7u equation: 



-56=28-7u

We move all terms to the left:

-56-(28-7u)=0

We add all the numbers together, and all the variables

-(-7u+28)-56=0

We get rid of parentheses

7u-28-56=0

We add all the numbers together, and all the variables

7u-84=0

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

7u=84

u=84/7

u=12

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