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4/x + 4/y = 13
3/x - 2/y = 21 |×2| ==> 6/x - 4/y = 42
eliminasi
4/x + 4/y = 13
6/x - 4/y = 42
-------------------- +
10/x = 55
x = 10/55
4/(10/55) + 4y = 13
4(55/10) + 4y = 13
22 + 4y = 13
4y = 13 - 22
4y = -9
y = -9/4
10/55 - (-9/4) = 40/220 + 495/220
= 535/220