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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/100 = 150/x // - 150/x
15/100-(150/x) = 0
15/100-150*x^-1 = 0
-150*x^-1 = -3/20 // : -150
x^-1 = 1/1000
-1 < 0
1/(x^1) = 1/1000 // * x^1
1 = 1/1000*x^1 // : 1/1000
1000 = x^1
x = 1000
x = 1000
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