$x-y+z;x=-2,\:y=-4\:,\:z=4$
$-6y^5-6y^5-\frac{7}{2}xz+7xz-\frac{5}{3}xz+\frac{6}{3}xz$
$\lim_{x\to0}\left(-\frac{sin^3x}{1-cosx}\right)$
$-580+79$
$\frac{d^2}{dx^2}\left(xe^{-x}\right)$
$\lim_{x\to\frac{6}{5}}\left(\frac{25x^2-36}{5x+6}\right)$
$z^2-30z+17=0$
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