$8x^4-24x^2+18$
$5:-2$
$\:\left(2m^3\:-\:5n^2\right)^2$
$6x-5\ge9x+1$
$4x^4+21x^3+7x^2+18x+40$
$\int\frac{5x^2-x+18}{x\left(x^2+9\right)}dx$
$\frac{a^3-b^3}{a+b}$
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