21+12z=-15

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Solution for 21+12z=-15 equation: 



21+12z=-15

We move all terms to the left:

21+12z-(-15)=0

We add all the numbers together, and all the variables

12z+36=0

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

12z=-36

z=-36/12

z=-3

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