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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
150000/s = 1500 // - 1500
150000/s-1500 = 0
150000*s^-1 = 1500 // : 150000
s^-1 = 1/100
-1 < 0
1/(s^1) = 1/100 // * s^1
1 = 1/100*s^1 // : 1/100
100 = s^1
s = 100
s = 100
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