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12. Rezolvati in R ecuatia;
a) x(x+2) - (x-3)(x+3) =13 c) (x-3)(x + 4) - 2(3x - 2)=(x-4)"; b) 4x(x - 1)-(2x+5)(2x - 5)=1; d) (x+5)(x+2)-3(4x - 3)=(x-5).
plssssss!​