икс-1 2./7=4x+2 5/14
х - 1_2/7 = 4х + 2_5/14
х-4х = 2_5/14 + 1_4/14
- 3х = 3_9/14
х= 51/14 : (-3)
х= - 51 / (14*3)
х= - 17/14
х= - 1_3/14