$\left(6x^4-m^2\right)\left(6x^4+m^2\right)$
$-3x^2+30x+3$
$9y^2+15y+6$
$-14.000-12.600+31.500+22.600$
$7\:x\:2\:-\:20\:x\:-\:3$
$2x-3\le-5$
$\frac{27\:x^6-1}{3\:x^2-1}$
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