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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
750/x = 2/3 // - 2/3
750/x-(2/3) = 0
750/x-2/3 = 0
750*x^-1 = 2/3 // : 750
x^-1 = 1/1125
-1 < 0
1/(x^1) = 1/1125 // * x^1
1 = 1/1125*x^1 // : 1/1125
1125 = x^1
x = 1125
x = 1125
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