$6ab-ab-5ab$
$\frac{2}{8}z^2\cdot\:\frac{2}{10}xz^4$
$2^9\cdot2$
$12s^2t^2-\:6s^5t^4\:+\:4s^4t$
$2x^5-2x^4-34x^3-30x^2$
$-\frac{7x-9}{x-3}$
$25-4y^2\:5-2y$
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