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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1000/1500 = 900/x // - 900/x
1000/1500-(900/x) = 0
1000/1500-900*x^-1 = 0
-900*x^-1 = -2/3 // : -900
x^-1 = 1/1350
-1 < 0
1/(x^1) = 1/1350 // * x^1
1 = 1/1350*x^1 // : 1/1350
1350 = x^1
x = 1350
x = 1350
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