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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+2/7 = 0
5*x^-1 = -2/7 // : 5
x^-1 = -2/35
-1 < 0
1/(x^1) = -2/35 // * x^1
1 = -2/35*x^1 // : -2/35
-35/2 = x^1
x = -35/2
x = -35/2
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