$\left(x+9\right)\left(8x-7\right)$
$x^2+-\frac{3}{5}+\frac{9}{100x^2}$
$3m^2-3n^2+n+3m^2-7+4$
$5\:\frac{2}{3}+6\:\frac{4}{8}+\frac{1}{6}'$
$2\frac{dy}{dx}+6y=12\sin\left(9\cdot x\right)$
$\int_1^23x^2+2dx$
$4\cdot13$
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