Пусть lg x = a
a^2 -2a +4 =9/(2+a)
2a^2 +a^3 -4a -2a^2 +8+4a -9 =0
a^3 -1 = 0
a^3 =1
a=1
lg x = 1
x = 10
Пусть lg x = a
a^2 -2a +4 =9/(2+a)
2a^2 +a^3 -4a -2a^2 +8+4a -9 =0
a^3 -1 = 0
a^3 =1
a=1
lg x = 1
x = 10