$\frac{18x^5-27x^4-3x^2}{9x^2}$
$\left(8xy\:+2m\right)\:\left(8xy+5m\right)$
$-12-68i$
$50\:-\:16$
$2x^2-4x^3+8x+3;\:x=2$
$\left(1+\sqrt{x+2}\right)^2$
$-2c+c-3c-c$
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