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1/x - 1/y = 3
y/xy - x/xy = 3
(y - x) /xy = 3
kalikan silang
-x + y = 3xy
di eliminasi
x + y = xy
-x + y = 3xy
---------------- -
2x = -2xy
2 = -y
y = -2
x + y = xy
x -2 = x (-2)
x - 2 = -2x
3x = 2
x = 2/3
jd bilangan itu adalah -2 dan 2/3
x + y = xy
x + y = -2 + 2/3 = -6/3 + 2/3 = -4/3
x.y = -2 x 2/3 = -4/4
-4/3 = -4/3. terbukti