3z-3z+4z-z=12

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Solution for 3z-3z+4z-z=12 equation: 



3z-3z+4z-z=12

We move all terms to the left:

3z-3z+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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