2z+4z-2z+4z-7z=9

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Solution for 2z+4z-2z+4z-7z=9 equation: 



2z+4z-2z+4z-7z=9

We move all terms to the left:

2z+4z-2z+4z-7z-(9)=0

We add all the numbers together, and all the variables

z-9=0

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

z=9

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