$\frac{21x^3+14x^2}{7x}$
$\frac{dy}{dx}=\frac{5x^2}{4y},5x=3$
$x+x+y$
$-1.-0.75$
$\frac{mn}{2}+\frac{mp}{x}-\frac{np}{m}$
$\int\sin\left(\frac{2}{\:3}\right)xdx$
$2x^3-50x$
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