$3 x - 6 ( - 4 y + 3 x ) - 4 y$
$3x\:+\:4x^2\:-\:5xy\:+\:12xz$
$7^2+\left|-9\right|$
$5\left(\frac{3}{5}\right)+3\left(\frac{4}{3}\right)$
$6\left|x+1\right|+2\left|x-4\right|$
$\frac{d}{dx}ye^x+2x+y=3$
$16x^2+8x-1$
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