2 вариант №1 Решить пропорцию. (x-2):1 5/31 = 7 1/4 : 1/3

(x-2) / (98/31) = (29/4) / (1/3)
(x-2) / (98/31) = 29/4 * 3/1
(x-2) / (98/31) = 87/4
x-2 = (87/4) * (98/31)
x-2 = (3 * 31 / 4) * (98 / 31)
x-2 = 3/4 * 98 = 294/4 = 147/2
x = 147/2 + 2 = 151/2 = 75.5