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17z-15z+3z-4z+4z=15
We move all terms to the left:
17z-15z+3z-4z+4z-(15)=0
We add all the numbers together, and all the variables
5z-15=0
We move all terms containing z to the left, all other terms to the right
5z=15
z=15/5
z=3
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