(8-5)х=8х-5*4
8х-5х=8х-20
8х-8х-5х=-20
-5х=-20
х=-20:(-5)
х=4
(8-5)*х=8*х-5*4, 13*х=8*х-20, 13*х-8*х=20, 5*х=20, х=20/5, х=4
(8-5)х=8х-5*4
8х-5х=8х-20
8х-8х-5х=-20
-5х=-20
х=-20:(-5)
х=4
(8-5)*х=8*х-5*4, 13*х=8*х-20, 13*х-8*х=20, 5*х=20, х=20/5, х=4