Пошаговое объяснение:
(х-74)+17=81.
x - 74 + 17 = 81
x - 57 = 81
x = 81+57
x = 138
(k-36)-23=92
k - 36 - 23 = 92
k - 59 = 92
k = 92+59
k = 151
(37+x)-48=59.
37 + x - 48 = 59
-11 + x = 59
x = 59+11
x = 70
104+(y-85)=57
104 + y - 85 = 57
19 + y = 57
y = 57 - 19
y = 38
