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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x+1/x-4 = 7/x-4 // - 7/x-4
7/x+1/x-(7/x)-4+4 = 0
7/x+1/x-7*x^-1-4+4 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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