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y = -1/(3x7 + 2x - 9)
y = -(3x7 + 2x - 9)-1
y' = -(-1)(3x7 + 2x - 9)-2(3x7 + 2x - 9)'
y' = (3x7 + 2x - 9)-2(21x6 + 2)
y' = (21x6 + 2)/(3x7 + 2x - 9)2

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Q: What is the derivative -1divided by 3 times x7 plus 2x-9?
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