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D( x )
12*x = 0
12*x = 0
12*x = 0
12*x = 0 // : 12
x = 0
x in (-oo:0) U (0:+oo)
17000/(12*x) = 10 // - 10
17000/(12*x)-10 = 0
4250/3*x^-1 = 10 // : 4250/3
x^-1 = 3/425
-1 < 0
1/(x^1) = 3/425 // * x^1
1 = 3/425*x^1 // : 3/425
425/3 = x^1
x = 425/3
x = 425/3
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