5/x + 6/y = 3 dan 3/x + 5/y = 6

5/x + 6/y = 3    dikalikan 3 → 15/x + 18/y  =  9
3/x + 5/y = 6    dikalikan 5 →  15/x + 25/y = 30
                                                --------------------- -
                                                         - 7/y  = -21
                                                              y  =  1/3
5/x + 6/(1/3)  =  3
5/x + 18 = 3
        5/x = 3 - 18
        5/x = -15
          x  = - 1/3