$9y-7x+5y+6x$
$x^2\cdot\left(x^2-2xy+y^2\right)$
$\left(k+3m-h\right)^2$
$2\left(2-3\right)+3\left(3-5\right)$
$\lim_{x\to\infty}\left(\frac{3}{4}\right)^x$
$\int\frac{\sqrt{x^2+121}}{5x}dx$
$\lim_{x\to1}\left(\frac{2x-2x^2}{x\:-\:\sqrt{2x-x^2}}\right)$
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