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D( w )
49*w-98 = 0
49*w-98 = 0
49*w-98 = 0
49*w-98 = 0 // + 98
49*w = 98 // : 49
w = 98/49
w = 2
w in (-oo:2) U (2:+oo)
(((11*w-22)/2)/(49*w-98))/4 = 0
(11*w-22)/(2*4*(49*w-98)) = 0
11*w-22 = 0 // + 22
11*w = 22 // : 11
w = 22/11
w = 2
w in { 2}
w belongs to the empty set
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