(80-60) x = x-50, I'll give you 20 when I finish in ten minutes

(80-60) x = x-50, I'll give you 20 when I finish in ten minutes

（80-60-1）x=-50
x=-50/19

12 19 32 18 26 17 21 36 36 18

So for example, 12 is the second letter in the first line. So it's W. and so on, 12 --- > W 19 --- > o 32 --- > x 18 --- > I 26 --- > H 17 --- > U21 --- > A36 --- > N36

Please use these numbers to work out a string of password 21,26,13,20,23,26,17,18,13,20, which seems to be in sesame door
That's it. No hint. Please be a master!

Any more hints
It has been deciphered as follows:
Each group of data represents an English alphabet, and is in reverse order, that is, 1 is Z, 2 is y, 3 is X Finally, 26 is a
It can be obtained by comparison
Fangdajing, obviously not a word, can only get Chinese "magnifying glass" Pinyin I don't know if I'm satisfied

12 19 32 18 26 17 21 36 18 from girls,

This is the letter on the keyboard. Each two digit number, the word on the ten digit number represents the number of lines, and the number on the one digit number represents the number of lines. So for example, 12 is the second letter on the first line. So it is w. and so on, 12 --- > W 19 --- > o 32 --- > x 18 --- > I 26 --- > H 17 --- > U21 --- > A36 --- > N36 -