$7.4z-5\left(-1.6z-2.4\right)$
$\lim_{x\to0}\frac{sen\left(x\right)}{\left(1+cos\:\left(x\right)\right)}$
$\:2a\:+\:ab$
$\lim_{x\to5}\left(\frac{x^2+2x-3}{x-3}\right)$
$5x^2-60x+180$
$x^2+\frac{3}{4}x=0$
$7\left(u+4\right)$
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