–2a+ (+11a )=, 9a, 9a2, -9a, -22a2, 7ab2+ (–2ab2), 5ab2, 14a2b4, -14a2b4, 9ab2, 4a+ (–6a) + (+15a) + (–a), 12a, -12a, 13a, -13a, 8ab5+ (–2ab5), 6ab5, 16ab, 6a3b3, 6, –6a2 – (+2a2), -8a2, 4a2, 4, 8, –13xy2 – (–xy2), -12xy2, -14xy2, 13, 12x2y4, 3a2b – 8a2b – 7a2b, -12a2b, 15a2b, 12a6b3, -12, –5ab+ 8ab – 9ab, -6ab, -6, -6a3b3, 6ab, (+2a2b) (+9ab2), +18a3b3, 11a3b3, 18a2b2, 11a2b2, (+9a2x5) (–a3), non si può, -9a5x5, 9a5x5, 8ax5, (–6a2b3)2, -6a4b5, -6a4b6, 6a4b6, 12a2b3, (-1/2 a2b)3, -1/2a5b3, -1/8 a6b3, 1/6a2b3, 1/8 a6b3

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