-20=29-u

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Solution for -20=29-u equation: 



-20=29-u

We move all terms to the left:

-20-(29-u)=0

We add all the numbers together, and all the variables

-(-1u+29)-20=0

We get rid of parentheses

1u-29-20=0

We add all the numbers together, and all the variables

u-49=0

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

u=49

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