$x ^ { 2 } - 8 x + 11 = 0$
$4\left(2n\right)$
$\frac{\left(4x^2+3x\right)}{x^2-6x+8}\le4$
$\left|-7-9\right|$
$\left(x+1\right)\left(x-2\right)\ge0$
$10m-5mn+5md$
$2x^2yz^4,x=1,y=2,z=-3$
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