12x (0,5x2 - 1/4y) - 15y(-1/3x + 0,2y2) -2xy =
Te 2 koło x i y to jest do kwadratu.
9x -16 = 0
9x = 16
9x = 16 | : 9
x = 1.7777777777778
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9x -16 = 0
Krok 29x = 16
9x = 16 | : 9
x = 1.7777777777778