156=84-u

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Solution for 156=84-u equation: 



156=84-u

We move all terms to the left:

156-(84-u)=0

We add all the numbers together, and all the variables

-(-1u+84)+156=0

We get rid of parentheses

1u-84+156=0

We add all the numbers together, and all the variables

u+72=0

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

u=-72

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