$3x^4-6x^2y$
$\:k^2-14k-68=-2$
$\frac{2}{5}x^2y-\frac{1}{4}y^2z-\frac{3}{2};\:x=3;\:y=-1\:;\:z=-2$
$\frac{2}{3}\cdot\frac{2}{c}$
$4cos\left(a\right)=0$
$124+643$
$-3z-3z$
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