(7х-5 -2х-1)(7х-5+2х+1)=0
(5х-6)(9х-4)=0
5х-6=0 или 9х-4=0
5х=6 9х=4
х=6/5=1,2 х=4/9
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(7х-5 -2х-1)(7х-5+2х+1)=0
(5х-6)(9х-4)=0
5х-6=0 или 9х-4=0
5х=6 9х=4
х=6/5=1,2 х=4/9