4/5 х 2 - 45 = 0 |*5
4x2 - 225 =0
(2x-15)(2x+15)=0
2х-15 =0 или 2х+15 = 0
х=7,5 или х=-7,5
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4/5 х 2 - 45 = 0 |*5
4x2 - 225 =0
(2x-15)(2x+15)=0
2х-15 =0 или 2х+15 = 0
х=7,5 или х=-7,5