$6\cdot\left|18+\left(-4\right)\cdot\left(9-4\right)\right|$
$\frac{d}{dx}x^3+y^7=3x-5y+9$
$-2x^2+4x+1$
$-3yz-4y+10z-5zy+9y$
$\lim_{x\to3}\left(\frac{2\cdot x-3}{x^2-9}\right)$
$x^2-13x-30$
$-\left(-12\right)$
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