$2\:\left(-8\:-\:3b\right)$
$\left(\frac{1}{x}-\frac{1}{\sin\left(x\right)}\right)$
$8x^2-4x-15$
$\frac{1-2-2-3}{-2}$
$12-\left(-6\right)$
$x^2+x-240$
$\left(-15\right).\left(-32\right)$
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