$90u^2+15u-30$
$x^4\frac{dy}{dx}+4x^3y=e^{-x}$
$\frac{10}{x^2-6x-16}$
$7x+18\ge x+6$
$\sin\left(0.0099\right)$
$12a-34a$
$\left(y^{-10}\right)^{-9}$
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