(x-1 9/17)+ 2 14/17=5 5/17(только с проверкой! )

(x - 26/17) + 48/17 = 90/17
x - 26/17 = 90/17 - 48/17 = 42/17
x = 42/17 + 26/17 = 68/17 = 4

Проверка
4 - 26/17 + 48/17 = 90/17
68/17 - 26/17 + 48/17 = 90/17
90/17 = 90/17