tolong bantu, thanks!

Misal :
1/(x + 1) = a
1/(y + 2) = b

6a + 5b = 3
Kalikan 2

12a + 10b = 6
9a - 10b = 1
Jumlah kan
21a = 7
a = 7/21 = 1/3
1/(x + 1) = 1/3
x + 1 = 3
x = 2

9a - 10b = 1
10b = 9 . 1/3 - 1
10b = 2
b = 1/5
1/(y + 2) = 1/5
y + 2 = 5
y = 3

y - x = 3 - 2 = 1