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18. Rezolvați prin metoda reducerii sistemele: x-2y+1_ x+y+13 + 15 a) 5 X- 3 y-5_5y 3 +2- 6 3 (2x-1 y+4 3 5 3x-2y-2-2- + -= 2 b) d) 4x+3 3 2 2x-y+2_x+y_1 2 3 2 (2x-5y+1_x+4y 10 5-x y-2 1_x+3,11 + -+ 3 4 2 6 12 15 = 1 x- 10​