$y'\:=\:\frac{1}{x^3}$
$x^3-x^2\:+\:7\:cuando\:x=7$
$x-3<2x$
$5cosx=3cosx+\sqrt{3}$
$2a-3b-6c-3a-11b-3c-5a-3b+4c$
$\left(-9\right)\left(-1\right)\:x\:\left(-8\right)\:x\:\left(-3\right)\:x\:\left(4\right)$
$3.77\cdot0.625$
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