300z+420z=28

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Solution for 300z+420z=28 equation: 



300z+420z=28

We move all terms to the left:

300z+420z-(28)=0

We add all the numbers together, and all the variables

720z-28=0

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

720z=28

z=28/720

z=7/180

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