5 + x2 = x2 + 6x + x + 6
7x = -1
x = -1/7
5+ x^2 = x^2 +6x +x + 6
5+ x^2 = x^2 + 7x + 6
x^2 - x^2 - 7x - 6 + 5 = 0
-7x = 1
x = - 1/ 7
ответ { - 1/ 7 }
