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simplificati fractiile:[tex] \frac{ x^{2} +x}{x+1} [/tex]=???? [tex] \frac{ 2 x^{2} -2}{3x+3} [/tex]=????? [tex] \frac{ x^{2} -9}{ x^{2} +6x+9} [/tex]=?????? [tex] \frac{ 4 x^{2} -4x+1}{4 x^{2} -1} [/tex] =?????? UEGENTTTTT!!!!!