-84=4u+3u

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Solution for -84=4u+3u equation: 



-84=4u+3u

We move all terms to the left:

-84-(4u+3u)=0

We add all the numbers together, and all the variables

-(+7u)-84=0

We get rid of parentheses

-7u-84=0

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

-7u=84

u=84/-7

u=-12

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