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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/32 = 10.5/x // - 10.5/x
4/32-(10.5/x) = 0
4/32-10.5*x^-1 = 0
-10.5*x^-1 = -1/8 // : -10.5
x^-1 = 0.01190476
-1 < 0
1/(x^1) = 0.01190476 // * x^1
1 = 0.01190476*x^1 // : 0.01190476
84.00001344 = x^1
x = 84.00001344
x = 84.00001344
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