$3y'\:+xy\:=\:x$
$9x^2+18xy^2+9y^4$
$\lim_{x\to\infty}\left(\frac{3^x}{3^x-2^x}\right)$
$4c\:+\:2c\:+\:3$
$10x+12^2$
$\frac{q}{2}<28$
$-\frac{90xyz}{-10y}$
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