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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4500/100 = 20500/x // - 20500/x
4500/100-(20500/x) = 0
4500/100-20500*x^-1 = 0
-20500*x^-1 = -45 // : -20500
x^-1 = 9/4100
-1 < 0
1/(x^1) = 9/4100 // * x^1
1 = 9/4100*x^1 // : 9/4100
4100/9 = x^1
x = 4100/9
x = 4100/9
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