$\frac{x^2+7x}{x}$
$\frac{3a^{3}b+6a^{2}b^{2}-9ab^{3}}{3a^{3}b^{3}}c$
$\int\frac{x-7}{\left(\left(x-5\right)^2\left(x-9\right)\right)}dx$
$2x^2-4y^2$
$-\left(-5\sqrt{5}\right)^2$
$-3\left(1+9a\right)$
$\frac{5x^2y^3}{-5y^3}$
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