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2(x-2)(x+3)-(x-3)²-(x+3)(x-2)

Răspuns :

2(x²-2x+3x-6)-(x²-6x+9)-(x²-2x+3x-6)= 2x²-4x+6x-6-x²+6x-9-x²+2x-3x+6=
14x-7x-9=7x-9