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D( x )
x <= 0
log(7)(5) = 0
x <= 0
log(7)(5) = 0
log(7)(5) = 0
t_1 = log(7)(5)
log(7)(5) = 0
t_1 = 0
x należy do R
x in (-oo:+oo)
x belongs to the empty set
log(7)(70)-((log(7)(35))/(log(7)(5))) = log(x)(y)
x belongs to the empty set
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