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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5/x = -0.5 // + 0.5
3.5/x+0.5 = 0
3.5*x^-1 = -0.5 // : 3.5
x^-1 = -0.14285714
-1 < 0
1/(x^1) = -0.14285714 // * x^1
1 = -0.14285714*x^1 // : -0.14285714
-7.00000014 = x^1
x = -7.00000014
x = -7.00000014
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