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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/x = (7/12)/5 // - (7/12)/5
25/x-((7/12)/5) = 0
25/x-7/60 = 0
25*x^-1 = 7/60 // : 25
x^-1 = 7/1500
-1 < 0
1/(x^1) = 7/1500 // * x^1
1 = 7/1500*x^1 // : 7/1500
1500/7 = x^1
x = 1500/7
x = 1500/7
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