уравнение 17*(3х-16)=85

51x-272=85

51x=85+272

51x=357

x=7

17 * (3х - 16) = 85
3х - 16 = 85 : 17
3х - 16 = 5
3х = 5 + 16
3х = 21
х = 21 : 3
х = 7
________________
17 * (3*7 - 16) = 85
17 * (21 - 16) = 85
17 * 5 = 85
85 = 85
Ответ: х = 7

Darknight (Sunny Storm)

спс