8 - x% = 12 - 100%
x = 100% - 12% = 88%

2 - y% = 12 - 100%
y = 100% - 12% = 88%

Таким образом, 8 - x% = 12 - 100% становится 8 - 88% = 12 - 100%, а 2 - y% = 12 - 100% становится 2 - 88% = 12 - 100%.