Пошаговое объяснение:
1) 8x + 6x = -20-8
14x = -28
x = -2
2) 9+40 = 3x+4x
49 = 7x
x = 7
3) 5/6x-4/9x = 9-16
15/18x-8/18x = -7
7/18x = -7
x = -7/(7/18)
x = -18
Пошаговое объяснение:
1) 8x + 6x = -20-8
14x = -28
x = -2
2) 9+40 = 3x+4x
49 = 7x
x = 7
3) 5/6x-4/9x = 9-16
15/18x-8/18x = -7
7/18x = -7
x = -7/(7/18)
x = -18