$\frac{x^{-4}}{x^5.x^{-3}}$
$\int\frac{x}{x^2-13x+40}dx$
$\left(9x-6\right)\left(9x+3\right)$
$3m^2n^3+3m^3n^2-6mn$
$5x+6\le5-2x$
$10^7.10$
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