$15-\left(-15\right)$
$\left(106\right)\left(98\right)$
$9c+11-9+6c-10c+8$
$\frac{2}{1}\:x\:\:\frac{1}{2}$
$\frac{2x}{x+4}\ge1$
$\left(-7-4\right)\cdot\left(-5+3\right)+\left(-8\right)$
$4x^4+14x^2-48$
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