(5х-3)(5х+3)-(4х-5)^2=4х-34
(5х-3)(5х+3)-(4х-5)*2=4х-34 (5х-3)(5х+3)-8х-10=4х-34 (5х-3)(5х+3)-8х-4х=-34+10 (5х-3)(5х+3)-12х=-24 5х*5х-3*3=-24 25х-9=-24 25х=-24+9 25х=-15 х=-15:25 х=-0,6