-7u-1=20

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Solution for -7u-1=20 equation: 



-7u-1=20

We move all terms to the left:

-7u-1-(20)=0

We add all the numbers together, and all the variables

-7u-21=0

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

-7u=21

u=21/-7

u=-3

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