1(3/7)z + 7/8 = 1(3/8)
1(3/7)z = 1(3/8) - 7/8
1(3/7)z = 4/8
10/7z = 4/8
80/56z = 28/56 | * 56
80z = 28
z = 80/28
z = 0.35
1(3/7)z + 7/8 = 1(3/8)
1(3/7)z = 1(3/8) - 7/8
1(3/7)z = 4/8
10/7z = 4/8
80/56z = 28/56 | * 56
80z = 28
z = 80/28
z = 0.35