$k^2+11k^2+30$
$\frac{\left(x^2-4\right)}{6\left(x^2-4\right)-\sqrt{x^2-4}}$
$1+0-24+0-25$
$2x^4-3x^3+3x-6+x^3-3x^2-5$
$6x^2-5x=6$
$x^2+6x\ge10x$
$\frac{4.326}{3}$
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