$7x-14y+21z$
$\frac{u}{6}+13.1=-6.1$
$\frac{-3x^3+2x-x^2}{-5x}$
$x^3+6x^2-13x-42$
$6x+5y-2z-4x-6y+5z$
$\left(-\frac{2}{5}\right)\cdot\left(\frac{1}{5}x-\frac{2}{5}\right)-x\ge-3$
$4-3\left(1-x\right)\le3$
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