4=(u+21)/8

Solution for 4=(u+21)/8 equation:

4=(u+21)/8

We move all terms to the left:

4-((u+21)/8)=0

We multiply all the terms by the denominator


-((u+21)+4*8)=0


We calculate terms in parentheses: -((u+21)+4*8), so:

(u+21)+4*8

We add all the numbers together, and all the variables

(u+21)+32

We get rid of parentheses

u+21+32

We add all the numbers together, and all the variables

u+53

Back to the equation:

-(u+53)


We get rid of parentheses

-u-53=0

We add all the numbers together, and all the variables

-1u-53=0

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

-u=53

u=53/-1

u=-53