$\left(-90\right)-\left(-20\right)$
$\frac{9xy^7}{15x^7y^3}$
$\frac{\sqrt{-11}}{2}$
$\left(4ab+2cd\right)^2$
$3.4.\frac{1}{p}$
$\frac{dy}{dx}=\frac{x+7}{x}$
$y-y$
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