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