$7x^3-7x$
$-a^2\:b^8\:-\:c^2$
$\left(u+6\right)^2$
$1^2-0.125$
$\:-13\:\cdot8$
$-\frac{7}{4x}\:+\:4\:<=\:\frac{9}{2}$
$\left|4-2+3\right|$
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