$\lim_{x\to0}\left(\frac{e^{2x+1}-e^{1-x}}{2x}\right)$
$\left(2abc\right)\left(-2ab\right)$
$\left(x^2-5x+1\right)\left(3x^2+2\right)$
$x^2-3x=8$
$x^2-3x=2$
$4m^2-1$
$x\left(11x-x^2\right)$
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