z+3z-3z+3z=20

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Solution for z+3z-3z+3z=20 equation: 



z+3z-3z+3z=20

We move all terms to the left:

z+3z-3z+3z-(20)=0

We add all the numbers together, and all the variables

4z-20=0

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

4z=20

z=20/4

z=5

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