(5х+3)²-(5х-1)(5х+1)=28х+4
25х²+30х+9-25х²+1-28х-4=0
2х+6=0; 2х=-6; х=-3
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(5х+3)²-(5х-1)(5х+1)=28х+4
25х²+30х+9-25х²+1-28х-4=0
2х+6=0; 2х=-6; х=-3