1,2а+7
2а+3
_______
3,2а+10
А=10:3,
А=3,125
76:12=a(ост 4),
12*a = 76-4
12a = 72
a = 72:12
a = 6
808:35=к(ост. 3)
35*k = 808-3
35k = 805
k = 805 : 35
k = 23