slope for w = (1/5) × [(-12 × 1) + (-17 × 2) + (-22 × 3) + (-27 × 4) + (-32 × 5)]
slope for w = (1/5) × [-12 - 34 - 66 - 108 - 160]
slope for w = (1/5) × (-380)
slope for w = -76

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