1 способ:
56 - (x+12) = 2456 - x - 12 = 2444 - x = 24-x = -20x = 20
2 способ:
56 - (x+12) = 2456 - x - 12 = 24-x = 24 - 56 + 12-x = -20x = 20
Ответ: x = 20.
1 способ:
56 - (x+12) = 24
56 - x - 12 = 24
44 - x = 24
-x = -20
x = 20
2 способ:
56 - (x+12) = 24
56 - x - 12 = 24
-x = 24 - 56 + 12
-x = -20
x = 20
Ответ: x = 20.