MONOMI SIMILI A : +2 ab³: - 8 ab³, + 4 ab³, - 19 ab³, MONOMIO OPPOSTO A + 7 mn: - 7 mn, MONOMIO OPPOSTO A - 35 xy: + 35 xy, MONOMI SIMILI A : - 4 xz³: + 11 xz³, - 21 xz³, + 52 xz³,

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