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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35/x-7-3 = (5*x)/x-7 // - (5*x)/x-7
35/x-((5*x)/x)-7-3+7 = 0
35/x-7-5-3+7 = 0
35*x^-1 = 8 // : 35
x^-1 = 8/35
-1 < 0
1/(x^1) = 8/35 // * x^1
1 = 8/35*x^1 // : 8/35
35/8 = x^1
x = 35/8
x = 35/8
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