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-2(x²-5x+x³)+3(x³-x)-7(x+2x²)

Răspuns :

[tex] - 2x {}^{2} + 10x - 2{x}^{3} + 3 {x}^{3} - 3x - 7x - 14 {x}^{2} = {x}^{3} - 16 {x}^{2} [/tex]