$\lim_{x\to0}\left(\frac{7^{4x}-1}{x}\right)$
$\left(\frac{2z^3x^{-2}}{y^2\left(2x^{-1}z\right)}\right)$
$2x+4xy-4y+12xy$
$\frac{\left(2x\right)^2-3^2}{2x+3}$
$x^2+14x+364$
$\left(x^{2n+1}\right)^2$
$\int x\left(\frac{7}{x^6}-sin\left(x\right)+\sqrt{x}\:\right)dx$
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