1) 86 - x = 49 : 786 - x = 7-x = 7 - 86-x = -79x = 79
2) 42 : x = 56 : 842 : x = 7x = 42 : 7x = 6
Ответ: x1 = 79, x2 = 6.
1) 86 - x = 49 : 7
86 - x = 7
-x = 7 - 86
-x = -79
x = 79
2) 42 : x = 56 : 8
42 : x = 7
x = 42 : 7
x = 6
Ответ: x1 = 79, x2 = 6.