$2^2-7x-4$
$10\left(3a\:-2\right)\:-5$
$\lim_{x\to3}\left(\frac{x^2-x-6}{x^2-2x-8}\right)$
$d^2f=x^4+3xy^2$
$3a+4+\sqrt{12a^{2}+34a^{2}-30}$
$\frac{3}{4}x\cdot5y$
$10x\:+\:2y\:+\:2y\:-\:4$
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