$0\cdot\left(-9\right)$
$\lim_{x\to0}\left(\frac{e^x}{4x}\right)$
$x^2+20x+100=0$
$z+3^3$
$x^2+8x+32$
$x^2-\frac{2}{3}x=0$
$16-4a^2$
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