А) (2(2х+8)+15-х-52)/26=0
(4х+16+15-х-52)/26=0
(3(х-7))/26=0
Х-7=0
Х=7
Б) (5(5-3х)-7(4х-1)+4*35)/35=0
(-43х+172)/35=0
-43х+172=0
Х=172/43
Х=4
В) (7(9-2х)+2(3х+15)-5*28)/28=0
(63-14х+6х+30-140)/28=0
(-8х-47)/28=0
-8х-47=0
Х=-(47/8)
Х=-5 7/8
Г) (5(х+4)-2(9-7х)+90)/30=0
(5х+20-19+14х+90)/30=0
(19х+105)/30=0
19х+105=0
Х=-(105/19)
Х=-5 10/19