$4\cdot0-5$
$19m-9m$
$\frac{5}{2}\left(x+1\right)$
$\lim_{x\to0}\left(\frac{2x\left(cos2x\right)-1}{sin\left(4x\right)-4x}\right)$
$9-\left(-14-\left(-20\right)\right)$
$-48x-16x^2=-144$
$6x+\frac{9}{8}+\frac{3}{8}x$
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