$2x^2\sqrt{4x^2}x+3$
$m^2-2m-15$
$\left(7x+x^4\right).\left(x+3\right)$
$\frac{3x^2+x-4}{x-1}$
$\log\left(-100\right)$
$x^2+20x+100=20$
$\lim_{x\to\infty}\frac{2x+3}{x+\sqrt[3]{x}}$
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