30+z+4z=180

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Solution for 30+z+4z=180 equation: 



30+z+4z=180

We move all terms to the left:

30+z+4z-(180)=0

We add all the numbers together, and all the variables

5z-150=0

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

5z=150

z=150/5

z=30

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