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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/1.25 = 49/x // - 49/x
2/1.25-(49/x) = 0
2/1.25-49*x^-1 = 0
-49*x^-1 = -1.6 // : -49
x^-1 = 0.03265306
-1 < 0
1/(x^1) = 0.03265306 // * x^1
1 = 0.03265306*x^1 // : 0.03265306
30.62500115 = x^1
x = 30.62500115
x = 30.62500115
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