4z-z=-21+9

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Solution for 4z-z=-21+9 equation: 



4z-z=-21+9

We move all terms to the left:

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

We add all the numbers together, and all the variables

4z-z-(-12)=0

We add all the numbers together, and all the variables

3z+12=0

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

3z=-12

z=-12/3

z=-4

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