1,2 - (х - 1/4) = 1/2 7000 - (5210 - х) = 4569
х - 1/4 = 1/2 - 1/2 5210 - х = 7000 - 4569
х - 1/4 = 0 5210 - х = 2431
х = 1/4 х = 5210 - 2431
х = 2779
5,2 - (6 - у) = 3,258 80 - (х + 4,097) = 18,36
6 - у = 5,2 - 3,258 х + 4,097 = 80 - 18,36
6 - у = 1,942 х + 4,097 = 61,64
у = 6 - 1,942 х = 61,64 - 4,097
у = 4,058 х = 57,543
12 - (х + 4 7/15) = 5 13/15
12 - х - 4 7/15 = 5 13/15
12 - х = 5 13/15 + 4 7/15 = 9 20/15 = 10 5/15 = 10 1/3
х = 12 - 10 1/3
х = 1 2/3