z+18=30-z

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Solution for z+18=30-z equation: 



z+18=30-z

We move all terms to the left:

z+18-(30-z)=0

We add all the numbers together, and all the variables

z-(-1z+30)+18=0

We get rid of parentheses

z+1z-30+18=0

We add all the numbers together, and all the variables

2z-12=0

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

2z=12

z=12/2

z=6

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