Условие:

Реши уравнения.
x − 12 = 0
25 + x = 25
x : 108 = 1
y : 1 = 37
x * 15 = 0
x * 18 = 18

x − 12 = 0
x = 0 + 12
x = 12
 
25 + x = 25
x = 25 − 25
x = 0
 
x : 108 = 1
x = 1 * 108
x = 108
 
y : 1 = 37
y = 37 * 1
y = 37
 
x * 15 = 0
x = 0 : 15
x = 0
 
x * 18 = 18
x = 18 : 18
x = 1