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D( x )
3-x = 0
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in (-oo:3) U (3:+oo)
t_1 = 0
t_1+0 = 0
t_1 = 0
t_1 = 0
x należy do R
x in (-oo:3) U (3:+oo)
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