$\frac{3}{x-1}-2<2$
$2xy^2=3$
$\frac{1}{\frac{1}{y-4}+\frac{1}{y-3}}$
$1+6-11-84+28+240$
$\frac{15}{\left(w^4-2w^2\right)+i\left(5w^3+8w\right)}$
$x\frac{dy}{dx}\:-\:4y\:-x^6e^x$
$\left(6+-4\right)^2+\left(2+-4\right)+6\cdot3$
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