1 способ:
84 - (124 - (x + 3)) = 2884 - 124 + x + 3 = 28-40 + x + 3 = 28x - 37 = 28x = 28 + 37x = 65
2 способ:
84 - (124 - (x + 3)) = 2884 - (124 - x - 3) = 2884 - 124 + x + 3 = 28-40 + x + 3 = 28x - 37 = 28x = 28 + 37x = 65
Ответ: x = 65
1 способ:
84 - (124 - (x + 3)) = 28
84 - 124 + x + 3 = 28
-40 + x + 3 = 28
x - 37 = 28
x = 28 + 37
x = 65
2 способ:
84 - (124 - (x + 3)) = 28
84 - (124 - x - 3) = 28
84 - 124 + x + 3 = 28
-40 + x + 3 = 28
x - 37 = 28
x = 28 + 37
x = 65
Ответ: x = 65