21=6+u/5

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Solution for 21=6+u/5 equation: 



21=6+u/5

We move all terms to the left:

21-(6+u/5)=0

We add all the numbers together, and all the variables

-(u/5+6)+21=0

We get rid of parentheses

-u/5-6+21=0

We multiply all the terms by the denominator


-u-6*5+21*5=0

We add all the numbers together, and all the variables

-1u+75=0

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

-u=-75

u=-75/-1

u=+75

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