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z/15-17=-30

We move all terms to the left:

z/15-17-(-30)=0

We add all the numbers together, and all the variables

z/15+13=0

We multiply all the terms by the denominator

z+13*15=0

We add all the numbers together, and all the variables

z+195=0

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

z=-195

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