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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-4 = (-4*x)/x-1 // - (-4*x)/x-1
7/x-((-4*x)/x)-4+1 = 0
7/x-4+1+4 = 0
7*x^-1 = -1 // : 7
x^-1 = -1/7
-1 < 0
1/(x^1) = -1/7 // * x^1
1 = -1/7*x^1 // : -1/7
-7 = x^1
x = -7
x = -7
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