Question

(2+5)(3х-7)+(2х-1)(2х+1)=(5х+3)(2х-5)

Answer 1

(6х-14+15х-35)+(4$x^{2}$-1)=10$x^{2}$-25х+6х-15

6$x^{2}$-40х+35=0
D/4=400-35*6=190
х1,2=(20+-$\sqrt{190}$):6