$\frac{3x+9}{2x+1}+2$
$4\:x^2-7.2\:x+3.24$
$\left(-3\right)+3-2-5-8-4+2+\left(-3\right)-\left(-2\right)$
$\left(3x+10\right)\left(2x-15\right)$
$-\frac{3}{x^2+8x+16}$
$\frac{\left(t+9\right)}{\left(t-3\right)}<-\frac{1}{2}$
$\frac{d^2}{dx^2}\left(\frac{1}{2}\cdot\:\sin\:\left(\frac{x}{3}\right)\right)$
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