40/3
Пошаговое объяснение:
7/x + 3 = 4/x - 4
7/x + 3 - 4/x - 4 = 0
7*(x - 4) - 4*(x + 3)/(x + 3)(x - 4) = 0
7x - 28 - 4x - 12/(x + 3)(x - 4) = 0
3x - 40 = 0
x = 40/3
40/3
Пошаговое объяснение:
7/x + 3 = 4/x - 4
7/x + 3 - 4/x - 4 = 0
7*(x - 4) - 4*(x + 3)/(x + 3)(x - 4) = 0
7x - 28 - 4x - 12/(x + 3)(x - 4) = 0
3x - 40 = 0
x = 40/3