-(21+5u)=0

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Solution for -(21+5u)=0 equation: 



-(21+5u)=0

We add all the numbers together, and all the variables

-(5u+21)=0

We get rid of parentheses

-5u-21=0

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

-5u=21

u=21/-5

u=-4+1/5

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