$91\cdot89$
$x^2-2x-48$
$\lim_{x\to-0}\left(\frac{e^{3x}-1}{x}\right)$
$\sqrt{9xy^3+\left(4y\right)^2xy}$
$14x^2+10xy+21x+15y$
$7+3r<4$
$-3b-3c$
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