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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1500/x = 35/20 // - 35/20
1500/x-(35/20) = 0
1500/x-7/4 = 0
1500*x^-1 = 7/4 // : 1500
x^-1 = 7/6000
-1 < 0
1/(x^1) = 7/6000 // * x^1
1 = 7/6000*x^1 // : 7/6000
6000/7 = x^1
x = 6000/7
x = 6000/7
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