$-15\left(-11\right)$
$2x-3x$
$121x^4-\:81y^2\:$
$52-4+8$
$\lim_{x\to-1}\left(\frac{x^3-64}{x-4}\right)$
$\lim_{x\to0}\left(\frac{e^{\sin\left(x\right)}}{\sin\left(x\right)}\right)$
$x^2-7x+6<0$
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