ПОМОГИТЕ №867 1,2,3 примеры

РЕШЕНИЕ 1) 2 4/7 : (0,5х - 23/35) = 7,5 2 4/7 = 3 3/4 *х - 4 13/14 3 3/4*х = - 7 1/2 х = - 7 1/2 : 3 3/4 = -2 -ОТВЕТ 3) (1/4  +3/4*х) : 0,45 = 25/36 1/4 + 3/4*х = 5/16 3/4*х = 5/16 -1/4 = 9/16 х = 9/16 : 3/4 = 3/4 - ОТВЕТ 2) (1 2/7*у  - 1/2) : 2,5 = 5,2 1 2/7*у - 1/2 = 5,2*2,5 = 13 1 2/7*у = 13 1/2 у = 13 1/2 : 1 2/7 = 10 1/2 4) 22*(17/26*х - 3/4) = 5 1/13 17/26*х - 3/4 = 5 1/13 : 22 = 3/13 17/26*х = 51/52  х = 1 1/2