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30. Rezolvați sistemele: a) 3x+2y x-2y__-9 2 3 c) x+2y_2x+3y=2 4 2x+y+3_x+3y-2-2 5 2 3 x+2y+4 2x+y+5 4 6 31. Rezolvati sistemalar =-1 b) d) (x-2y-7 2x-y-9 4 5 x+2y+5 x+y+6 3 2 x+y+9 2 x-2y-8 3 =-1 2x=y+5 3 2x-y+6 5 =4 =-5​