1−6c / 6 : 48c−8 / 8c = 1−6c / 6 : 8 (6c−1) / 8c =1−6c / 6 : (6c−1) / c =
=1−6c / 6 * с/ (6c−1) = −(6c-1) / 6 * с/ (6c−1) = −(6c-1) с/ 6 (6c−1) =-с/6
