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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)
0 = (7-7)/(3-x) // - (7-7)/(3-x)
0-((7-7)/(3-x)) = 0
-((7-7)/(3-x)) = 0
(-1*0)/(3-x) = 0
( -1 )
-1 = 0
x belongs to the empty set
( 0 )
0 = 0
x należy do R
x in (-oo:3) U (3:+oo)
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