$\left(19-4x\right)-\left(9+2x\right)$
$\frac{5}{\frac{5}{3}}$
$2.5mn^2-0.9mn^2+0.45mn^2$
$8m^6n^{15}+27m^{12}n^3$
$\lim_{x\to0}\left(\frac{x^2}{\sqrt{x^2+12}-12}\right)$
$x-2^3$
$5\cos x^23x$
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