$x^2-2x-5=0$
$\frac{d}{dx}\left(400\cdot e^{-0.02x}\right)\cdot x$
$2x^2+12x$
$10x+6\le2x+14$
$64b^2+112b+49$
$\:t^2\:-\:12t\:+\:9$
$a^2-4ab+4^2$
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