$2x^2+6x+8x^3-12x^4$
$25a^2-30ab+5b^2$
$\frac{8a^9+y^9}{2a^3+y^3}$
$12m^3n+72mn^4$
$\lim_{x\to0}\:\frac{sin\left(-2x+3x^2\right)}{x}$
$\left(2xy-3wz\right)^3$
$x-5>-7$
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