$6x^2-9x^3$
$25n^2-20+4$
$2x^2-3\cdot2x^3-3x^2+4x$
$2x^4-12x^3+18x^2$
$\lim_{x\to0}\left(\cos\left(x\right)^2^{\left(\frac{1}{\sin\left(x\right)}\right)}\right)$
$-9\:x\:7$
$10xy+12xy-\left(-4xy-2xy\:\right)$
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