$\frac{4x^2z-0,5y^3z}{3}$
$\frac{dy}{dx}=12x+12y$
$-53\cdot18$
$-\:20\:-\:\left(\:+\:55\:\right)\:+\:45$
$18=13x+5$
$9x^4+13x^2-23x+49\:para\:x=5$
$8x^2-8x-25$
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