Условие:

Реши уравнения.
75 − x = 75
4 + x = 64
89 − y = 0

75 − x = 75
x = 0
750 = 75
75 = 75
 
4 + x = 64
x = 60
4 + 60 = 64
64 = 64
 
89 − y = 0
y = 89
8989 = 0
0 = 0