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D( x )
2*x^5 = 0
4*x^5 = 0
2*x^5 = 0
2*x^5 = 0
2*x^5 = 0 // : 2
x^5 = 0
x = 0
4*x^5 = 0
4*x^5 = 0
4*x^5 = 0 // : 4
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
7/(2*x^5)+3/(4*x^5) = 7/1000 // - 7/1000
7/(2*x^5)+3/(4*x^5)-(7/1000) = 0
7/(2*x^5)+3/(4*x^5)-7/1000 = 0
17/4*x^-5 = 7/1000 // : 17/4
x^-5 = 7/4250
-5 < 0
1/(x^5) = 7/4250 // * x^5
1 = 7/4250*x^5 // : 7/4250
4250/7 = x^5
x^5 = 4250/7 // ^ 1/5
x = (4250/7)^(1/5)
x = (4250/7)^(1/5)
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