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(3x+2)(x-1)+(3x+2)(x+1)=0,cum sa o rezolv?

Răspuns :

(3x+2)(x-1)+(3x+2)(x+1)=0
(3x+2)(x-1+x+1)=0
(3x+2)·2x=0
x=0
3x+2=0  x=-2/3