$-7m^2n+3mn-4m^2n-9mn$
$3\sqrt{2}-\sqrt{2}$
$9a^2-25$
$x^3-8^3$
$\frac{d}{dx}\left(x^2+y+y^3=1\right)$
$\frac{x}{\sqrt{5x}}$
$6\log\left(a\right)+\log\left(b\right)$
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