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D( x )
x/60 = 0
x/60 = 0
x/60 = 0
1/60*x = 0 // : 1/60
x = 0
x in (-oo:0) U (0:+oo)
186000/(x/60) = 0
11160000*x^-1 = 0 // : 11160000
x^-1 = 0
x należy do O
x belongs to the empty set
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