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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/x = 12.5/100 // - 12.5/100
13/x-(12.5/100) = 0
13/x-0.125 = 0
13*x^-1 = 0.125 // : 13
x^-1 = 0.00961538
-1 < 0
1/(x^1) = 0.00961538 // * x^1
1 = 0.00961538*x^1 // : 0.00961538
104.00004992 = x^1
x = 104.00004992
x = 104.00004992
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