4z+21=-15

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Solution for 4z+21=-15 equation: 



4z+21=-15

We move all terms to the left:

4z+21-(-15)=0

We add all the numbers together, and all the variables

4z+36=0

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

4z=-36

z=-36/4

z=-9

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