$4\cdot\:4\cdot\:4$
$\:-\frac{3}{4}a^2b-\frac{1}{8}a^2b$
$\lim_{x\to\infty}\left(x^2-\sqrt{x^4+7x^2+1}\right)$
$\frac{3x}{3x-4}-\frac{4}{3x-4}$
$7-3>0$
$7x<0$
$6z^2-5z-6$
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