3. Найди уравнения, которые ты пока не можешь решить. Исправь их и реши. 78+x=40, x-23=60, 50-x=64

1. Solve for x in x - 23 = 60: x = 60 + 23 = 83.
2. Solve for x in 50 - x = 64: x = 50 - 64 = -14.
3. The equation 78 + x = 40 has a negative solution for x (x = -38), which might be considered unsolvable in a typical elementary context without negative numbers.