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D( x )
21^r = 0
21^r = 0
21^r = 0
x należy do O
x in (-oo:+oo)
t_1 = (7*r^6*u^-10)/(21^r)-8*u^8
t_1+0 = 0
t_1 = 0
t_1 = 0
x należy do R
x in (-oo:+oo)
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