$\left(y^2-4y+7\right)^2$
$3x^{2\:}+6x\:+\:3$
$( a - b x ) ( a + b x )$
$-11\:+\:-10\:+\:-3\:+\:-6\:+\:12\:+\:18\:+21\:+19\:+\:15+\:9+\:2+\:-8$
$-k^2+7k+2$
$4\cdot10^4+8\cdot10^3+5$
$x^2+12x\:>6x$
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