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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
650/x = 9/16 // - 9/16
650/x-(9/16) = 0
650/x-9/16 = 0
650*x^-1 = 9/16 // : 650
x^-1 = 9/10400
-1 < 0
1/(x^1) = 9/10400 // * x^1
1 = 9/10400*x^1 // : 9/10400
10400/9 = x^1
x = 10400/9
x = 10400/9
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