$3x^2-9x-30$
$\frac{x-12}{7}<3$
$\frac{dy}{dx}\cdot x=y+3x^3\cdot y$
$8x=4x^2-1$
$\sqrt[3]{ab^3}$
$\lim_{x\to\infty}\left(\frac{6x+2}{3x+5}\right)$
$\frac{\left(x^2+6x-2\right)}{x-6}$
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