Пошаговое объяснение:
1) 20 + x = 18
x = 18 - 20
x = -2
2) 5 - x = 10
x = 5 - 10
x = -5
3) x - 6 = -11
x = -11 + 6
4) x + 4 = -1
x = -1 - 4
Пошаговое объяснение:
1) 20 + x = 18
x = 18 - 20
x = -2
2) 5 - x = 10
x = 5 - 10
x = -5
3) x - 6 = -11
x = -11 + 6
x = -5
4) x + 4 = -1
x = -1 - 4
x = -5