$3\left(-4x+20\right)$
$\frac{d^4y}{dx^4}\:y=senx+cosx$
$\frac{2n^{-1}}{n^4}$
$\left(23\right)\left(x-3\right)$
$x^2+\frac{3}{5}=-\frac{1}{25}$
$3x^2-27<0$
$\left(-18\right)\left(-3\right)\left(+1\right)$
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