Find the gradient of the normal to the curve $y = x^{2} + 5 x$ at the point where $x = 1$ .

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Find the derivative of $y = \frac{l n x}{x ^{2}}$ with respect to $x$ for $x > 0$ .
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Find the equation of the normal to the curve $y = 3 e^{2 x} - 1$ at the point where $x = 0$ .
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