$15+\left(-9+12\right)-\left(-10-9-15\right)-\left(-21\right)$
$\left(4x^{n+4m}\right)\left(-3x^{n-5m}\right)$
$x^2\frac{dy}{dx}-xy-1=0$
$\sin=-\frac{5}{6}$
$\left(5a+4\right)\left(5a+3\right)$
$186-979$
$^{30}\sqrt{16x^8}$
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