3z=120-z

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Solution for 3z=120-z equation: 



3z=120-z

We move all terms to the left:

3z-(120-z)=0

We add all the numbers together, and all the variables

3z-(-1z+120)=0

We get rid of parentheses

3z+1z-120=0

We add all the numbers together, and all the variables

4z-120=0

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

4z=120

z=120/4

z=30

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