-7u+4u=21

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Solution for -7u+4u=21 equation: 



-7u+4u=21

We move all terms to the left:

-7u+4u-(21)=0

We add all the numbers together, and all the variables

-3u-21=0

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

-3u=21

u=21/-3

u=-7

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