Объяснение:
7/(x+6) = -7/6
42/6*(x+6) = -7(x + 6)/6*(x+6)
ОДЗ: x ≠ -6
42 = -7(x + 6)
42 = -7x - 42
7x = - 42 - 42
7x = -84
x = 84 : 7
x = 12
