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D( u )
8-u = 0
6*u-48 = 0
8-u = 0
8-u = 0
8-u = 0 // - 8
-u = -8 // * -1
u = 8
6*u-48 = 0
6*u-48 = 0
6*u-48 = 0 // + 48
6*u = 48 // : 6
u = 48/6
u = 8
u in (-oo:8) U (8:+oo)
7/(6*u-48)-(5/(8-u)) = 0
7/(6*u-48)-5*(8-u)^-1 = 0
7/(6*u-48)-5/(8-u) = 0
(7*(8-u))/((6*u-48)*(8-u))+(-5*(6*u-48))/((6*u-48)*(8-u)) = 0
7*(8-u)-5*(6*u-48) = 0
296-37*u = 0
(296-37*u)/((6*u-48)*(8-u)) = 0
(296-37*u)/((6*u-48)*(8-u)) = 0 // * (6*u-48)*(8-u)
296-37*u = 0
296-37*u = 0 // - 296
-37*u = -296 // : -37
u = -296/(-37)
u = 8
u in { 8}
u belongs to the empty set
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