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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/10)*X = x/x-(4/5)-1 // - x/x-(4/5)-1
(3/10)*X-(x/x)+4/5+1 = 0
(3/10)*X+4/5-1+1 = 0
3/10*X+4/5 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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