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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+4/x+1+7 = 1 // - 1
1/x+4/x-1+1+7 = 0
5*x^-1 = -7 // : 5
x^-1 = -7/5
-1 < 0
1/(x^1) = -7/5 // * x^1
1 = -7/5*x^1 // : -7/5
-5/7 = x^1
x = -5/7
x = -5/7
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