z+2z+z=12

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Solution for z+2z+z=12 equation: 



z+2z+z=12

We move all terms to the left:

z+2z+z-(12)=0

We add all the numbers together, and all the variables

4z-12=0

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

4z=12

z=12/4

z=3

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