$77f-29f$
$-\frac{3}{5}x-\frac{2}{7}\le\frac{3}{4}$
$5\:\cdot\:-3\:+\:-2\:\cdot\:9$
$\frac{x^2-9y^2}{3x+9y}$
$\int_e^{10-x}dx$
$x^2-50x+225$
$\left(a^2+3ab\right)+\left(6b^2+2ab\right)$
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