Пошаговое объяснение:
t-4=8
t=8+4
t=12
156/19; 156
t-4/19=8
19t - 4 = 8 * 19
19t - 4 = 152
19t = 156
t = 156/19
(t-4)/19 = 8
t - 4 = 152
t = 156
