$12x+151>19$
$\left(\frac{36x^2-49y^2}{6x+7y}\right)$
$\frac{5x^4-25^5+20x^6}{-5x^4}$
$2\:cos2\:a\:-\:1$
$16a^2-7b^2-3b-2a^2$
$\int\frac{4}{\left(u^2+3\right)^2}dx$
$\frac{dx}{dy}+2y=0$
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