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+15=0

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

-u=-15

u=-15/-1

u=+15

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