$\left(a^{-1}b^{-1}c^{-1}\right)^2$
$x^4-x^2+2x+2$
$7a+6c+4c$
$-15a^2-24a^2$
$22x^{2}-20x+50$
$\left|3-9\right|-\left|4\right|$
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