$\frac{\left(2a^2b^3\right)^3}{4a^3b^7}$
$6x^2+13x-6$
$\frac{-144}{4}$
$\frac{d}{dx}2e^{x^2}\cdot x+\frac{2}{x}$
$4k-k\left(-3+4k\right)$
$6x\left(x+1\right)^2$
$x^2-4x+\frac{4}{2}$
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