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c)-9z-(4-3z)-8y-(-7z+8y)+(-2y-7)= -9z-4+3z-8y+7z-8y-2y-7=-18y+z-11
c)-9z-(4-3z)-8y-(-7z+8y)+(-2y-7)=-9z-4+3z-8y+7z-8y-2y-7= z-11-18y
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