$8x^6-6x^54x^4+12x^2+20$
$x^2+18x-3=0$
$\left(7x-8\right)\left(x-5\right)$
$-1+2\cdot3^2$
$\left(-2x+-3y+-4z\right)^2$
$-x^2-3x+40<0$
$\left(5k-9\right)^2$
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