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D( x )
x^6 = 0
x^6 = 0
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
7*e^7*x*x^3-((3*e^7*x*x^2)/(x^6)) = 0
7*e^7*x*x^3-3*e^7*x^-3 = 0
7*e^7*x^4-3*e^7*x^-3 = 0
x^-3*(7*e^7*x^7-3*e^7) = 0
7*e^7*x^7 = -(-3*e^7) // : 7*e^7
x^7 = 3/7
x^7 = 3/7 // ^ 1/7
x = (3/7)^(1/7)
1/(x^3) = 0
1*x^-3 = 0 // : 1
x^-3 = 0
x należy do O
x = (3/7)^(1/7)
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