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9z+4z+3z+3z-15z=20
We move all terms to the left:
9z+4z+3z+3z-15z-(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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