4z+9=-21

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Solution for 4z+9=-21 equation: 



4z+9=-21

We move all terms to the left:

4z+9-(-21)=0

We add all the numbers together, and all the variables

4z+30=0

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

4z=-30

z=-30/4

z=-7+1/2

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