$3x^6-\frac{2}{3}\sqrt{3x^3}a+\frac{a^2}{9}$
$\frac{2\cdot107}{63\times10^{-27}\cdot123\times10^{-9}}$
$2x^3y^2-4x^2y^3+2xy^4$
$-2x-16x+25$
$\left(-4x^3\:-\:2x^2\right)^2$
$\lim_{x\to3}\left(\frac{5e^x-1}{sin\:3x}\right)$
$20a^2-7a-40$
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