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D( x )
x^(19/7) = 0
x^(19/7) = 0
x^(19/7) = 0
1*x^(19/7) = 0 // : 1
x^(19/7) = 0
x = 0
x in (-oo:0) U (0:+oo)
((8.92*10^-7)/(x^(19/7)))^4 = 0
0 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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