2х-3)(2х+3)=(х-1)(х+1)+(5х+2)(х-14)

(2х)^2-9=(x^2-1)+(5x)^2- 60 +2x-82
4x^2-9=x^2-1+25x^2-142
4x^2-9=26x^2-143
4x^2-9-26x^2+143=0
-22x^2+134=0
-22x^2=-134
x^2=-134/(-22)
x^2=2948
x=+ и - корень из 2948