21=u/2-13

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Solution for 21=u/2-13 equation: 



21=u/2-13

We move all terms to the left:

21-(u/2-13)=0

We get rid of parentheses

-u/2+13+21=0

We multiply all the terms by the denominator


-u+13*2+21*2=0

We add all the numbers together, and all the variables

-1u+68=0

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

-u=-68

u=-68/-1

u=+68

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