21=-7(2+z)

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Solution for 21=-7(2+z) equation: 



21=-7(2+z)

We move all terms to the left:

21-(-7(2+z))=0

We add all the numbers together, and all the variables

-(-7(z+2))+21=0



We calculate terms in parentheses: -(-7(z+2)), so:

-7(z+2)

We multiply parentheses

-7z-14

Back to the equation:

-(-7z-14)



We get rid of parentheses

7z+14+21=0

We add all the numbers together, and all the variables

7z+35=0

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

7z=-35

z=-35/7

z=-5

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