100(19+15x-84):6 = 4
(15x-65):6 = 4:100
15x-65 = 4*6:100
15x-65 = 0.24
15x = 65.24
x = 65.24: 15 = 4целых 131/375
100(19+15x-84):6 = 4
(15x-65):6 = 4:100
15x-65 = 4*6:100
15x-65 = 0.24
15x = 65.24
x = 65.24: 15 = 4целых 131/375