$2x=12$
$\frac{28x^9y^2}{14x^2y^2}$
$12+y+17+z$
$43+5-\left(2+5+43\right)+2$
$x^2+54x+72$
$-\int\frac{1}{e^{3x}}dx$
$\lim_{x\to0}\left(\frac{e^{2x}-e^{-2x}-4x}{x-cosx}\right)$
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