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Calculati:
(x+1)(5x+6)-(5x-7)(x+1)=


Răspuns :

(x+1)(5x+6)-(5x-7)(x+1) =
5x²+6x+5x+6-5x²-5x-7x-7 =
-x-1.


J'espère aidé :)
5x^2+6x+5x+6-5x^2-5x+7x+7=
13x+13