maaf ada yang bisa ?? saya tidak mengerti sorry

misal 1/a = x, 1/b = y, dan 1/c = z, maka
x + y + z = 2....1)
2x -3y -4z = -3......2)
3x -2y -z = 7......3)
..1) dan ..3
x + y + z = 2
3x -2y -z = 7
----- ------------ +
4x -y = 9.....4)
dari. ...1) dan......2)
x + y + z = 2. ( kali 4 )
4x + 4y + 4z = 8
2x - 3y - 4z = -3
--------------------- +
6x + y = 5......5)
4x - y = 9........4)
--------------------- +
10x = 14
x = 14/10 = 7/5.
dari...4) 4x- y = 9
4(7/5) - y = 9
28/5 - y = 9
-y = 9 - 28/5
-y = 45/5 - 28/5 = 17/5
y = -17/5
dari...1) x + y + z = 2
7/5 + -17/5 + z = 2
-10/5 + z = 2
-2 + z = 2
z = 2 + 2 = 4
dari pemisalan.
x = 1/a ==» 1/a = 7/5 . maka a = 5/7
y = -17/5 ==» 1/b = -17/5, maka b = -5/17
z = 4 ==» 1/c = 4. maka c = 1/4
HP = { 5/7, -5/17, 1/4 }