решение уравнения 67-21у=25 19у-200=47., 83+29х=982

Решение:

67 - 21y = 25

-21y = 25 - 67

-21y = -42

y = (-42) : (-21)

y = 2

19y - 200 = 47

19y = 47 + 200

19y = 247

y = 247 : 19

y = 13

83 + 29x = 982

29x = 982 - 83

29x = 899

x = 899 : 29

x = 31