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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
150/x = 18/100 // - 18/100
150/x-(18/100) = 0
150/x-9/50 = 0
150*x^-1 = 9/50 // : 150
x^-1 = 3/2500
-1 < 0
1/(x^1) = 3/2500 // * x^1
1 = 3/2500*x^1 // : 3/2500
2500/3 = x^1
x = 2500/3
x = 2500/3
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