21=3(8+z)

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Solution for 21=3(8+z) equation: 



21=3(8+z)

We move all terms to the left:

21-(3(8+z))=0

We add all the numbers together, and all the variables

-(3(z+8))+21=0



We calculate terms in parentheses: -(3(z+8)), so:

3(z+8)

We multiply parentheses

3z+24

Back to the equation:

-(3z+24)



We get rid of parentheses

-3z-24+21=0

We add all the numbers together, and all the variables

-3z-3=0

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

-3z=3

z=3/-3

z=-1

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