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8/x+1 - 10/y+3 + 5/z+4 =7..........2
6/x+1 + 15/y+3 + 2/z+4 =8.........3
eliminasi x di pers 1 dan 2:
8/x+1 + 10/y+3 + 6/z+4 = 12
8/x+1 - 10/y+3 + 5/z+4 = 7 (-)
20/y+3 + 1/z+4 = 5............4
eliminasi x di pers 1 dan 3:
12/x+1 + 15/y+3 + 9/z+4 = 18
12/x+1 + 30/y+3 + 4/z+4 = 16 (-)
- 15/y+3 + 5/z+4 = 2..........5
eliminasi z di pers 4 dan 5:
100/y+3 + 5/z+4 = 25
- 15/y+3 + 5/z+4 = 2 (-)
115/y+3 = 23
5 = y+3
y = 2, maka z= 1-4
z= -3
maka: 4/x+1 + 5/y+3 + 3/z+4 = 6
4/x+1 + 5/2+3 + 3/-3+4 = 6
4/x+1 = 6 - 1 - 3
x+1 = 2
x = 1
x, y, z = 1, 2, -3