30z-30z+z+9z=40

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Solution for 30z-30z+z+9z=40 equation: 



30z-30z+z+9z=40

We move all terms to the left:

30z-30z+z+9z-(40)=0

We add all the numbers together, and all the variables

10z-40=0

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

10z=40

z=40/10

z=4

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