0,8(100-0,04х)=8,64х:1,15=0,160,408:х=1,7

0,8 * (100 - 0,04х) = 8,64              х : 1,15 = 0,1680 - 0,032х = 8,64                         х = 0,16 * 1,1580 - 8,64 = 0,032х                         х = 0,18471,36 = 0,032хх = 71,36 : 0,032                           0,408 : х = 1,7х = 2230                                        х = 0,408 : 1,7                                                      х = 0,24