172=20-u

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Solution for 172=20-u equation: 



172=20-u

We move all terms to the left:

172-(20-u)=0

We add all the numbers together, and all the variables

-(-1u+20)+172=0

We get rid of parentheses

1u-20+172=0

We add all the numbers together, and all the variables

u+152=0

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

u=-152

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