$8x<x+56$
$45x^2-81$
$0-2\cdot0<4$
$\left(x^2+3x^{-2}\right)\left(x^2+3x^3\right)$
$\left(x+13\right)\left(x+2\right)\left(x+16\right)$
$2x^3-7x+2$
$2a+5a-3ab-4a+b$
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