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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15000/x+10000/x = 40 // - 40
15000/x+10000/x-40 = 0
25000*x^-1 = 40 // : 25000
x^-1 = 1/625
-1 < 0
1/(x^1) = 1/625 // * x^1
1 = 1/625*x^1 // : 1/625
625 = x^1
x = 625
x = 625
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