$\left(+18\right):\left(-3\right)-\left(-8\right)$
$\frac{\sin\left(x\right)}{\frac{1}{\sin\left(x\right)}}-\frac{\cos\left(x\right)}{\frac{1}{\cos\left(x\right)}}$
$\frac{d}{dx}\frac{3x-7}{x+2}$
$-2\left(x-2y+4\right)$
$3\sin^2x-7\sin x-6$
$-5x-9=-54$
$-8x\:-\:10\:>\:18\:-\:16x$
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