21+8z=-4(3z+9)

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Solution for 21+8z=-4(3z+9) equation: 



21+8z=-4(3z+9)

We move all terms to the left:

21+8z-(-4(3z+9))=0



We calculate terms in parentheses: -(-4(3z+9)), so:

-4(3z+9)

We multiply parentheses

-12z-36

Back to the equation:

-(-12z-36)



We get rid of parentheses

8z+12z+36+21=0

We add all the numbers together, and all the variables

20z+57=0

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

20z=-57

z=-57/20

z=-2+17/20

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