найдите область определения функции y=(5/(x+6))-(Sqrt[4-7x])

 y=(5/(x+6))-√(4-7x){4-7х≥0  { -7x≥-4   { x≤4/7  x≠-6 ,      x≠-6,       x≠0 -------------------  -6--------------------------- 4/7----------------------->x\\\\\\\\\\\\\\\\\\\\\\\\\\\  \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\Ответ:(-∞;-6)∪(-6;4/7]