$4x^2+12x-9$
$-2.5\:x\:-4.5$
$750+50x>1000$
$\frac{\left(2x^3-3x+4\right)}{\left(x^2+9\right)}$
$\lim_{t\to-1}\left(\frac{t^2+1}{\left(t^3+2\right)\left(t^4+1\right)}\right)$
$\sqrt{64x^4}$
$-9mn-7mu$
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