$9\cdot7-6\cdot10-7\left(-4\right)$
$\left(-x^2y^5\right)\left(-3x^3y^2\right)$
$\frac{dy}{dx}=\frac{2x-y}{x+2y}$
$\frac{d}{dx}8x^3+6x^2=4xy^2-7y^3-9$
$7n+7$
$\frac{4}{x^2}=\frac{1}{x^2}+\frac{1}{x}$
$\frac{20xy^4}{36x^2y^2}$
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