$3x\:+\:9y\:-\:10z\:-\:3y\:+\:10z\:-\:x$
$3\:-\:4k\:+\:2$
$4x^2+1x+49$
$3\left(-3u+8\right)+5\left(9u-4\right)$
$6x^2e^{-y}-y'=0$
$\lim_{x\to0}\left(\frac{x^3-4x+3}{x^2-x}\right)$
$-16-4x^6$
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