$2x+1<4$
$\frac{x^3}{1-x}$
$\sqrt{10+\sqrt{32+\sqrt{13+\sqrt{x}}}=4}$
$\:ab^2=-4$
$\frac{n^3-1000}{n-10}$
$\left(3x^2+2x-5\right)\left(2x^2+x-3\right)$
$1+2-3x^2-3x^4+3x^4-3-3$
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