$\left(a^2-4b\right)^4$
$\left(u\:+\:2\right)\left(u\:+\:5\right)$
$8^9\cdot8^2$
$x^2-1\left(y'\right)_{-xy}$
$x^3-3x^2+4$
$62+971$
$13x\:-\:5\:=\:-5\:+\:13x$
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