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rezovati in IR ecuatia (x-1)(x+1)=2(x2-5); 2x+(x-1)2=3x2+8; (5x-1)2-1=0; (t+3)(t-5)=-15; 17-(a-3)(a-4)=-a2+2a; 8z2-(z+3)2=-6(z+4);