2/4 = 1/25/8 = 0.6252.4 = 12/55/75.6 = 56/10 = 28/5(5/7) * (28/5 - 2.4y) = 2.4 * (0.625 - 0.5y)(5/7) * (28/5) - (5/7) * 2.4y = (5*28)/(7*5) - (5*2.4)/7 y = 140/35 - 12/7 y = 4 - 12/7 y2.4 * 0.625 - 2.4 * 0.5y = 1.5 - 1.2y4 - 12/7 y = 1.5 - 1.2y4 - 1.5 = 12/7 y - 1.2y2.5 = 12/7 y - 6/5 y2.5 = (12*5 - 6*7) / 35 y2.5 = (60 - 42) / 35 y2.5 = 18/35 yy = 2.5 / (18/35)y = (5/2) * (35/18)y = (5 * 35) / (2 * 18)y = 175 / 36Ответ: y = 175/36