21=u/3-16

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Solution for 21=u/3-16 equation: 



21=u/3-16

We move all terms to the left:

21-(u/3-16)=0

We get rid of parentheses

-u/3+16+21=0

We multiply all the terms by the denominator


-u+16*3+21*3=0

We add all the numbers together, and all the variables

-1u+111=0

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

-u=-111

u=-111/-1

u=+111

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