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D( y )
6*y+(18/6)*y+9 = 0
6*y+(18/6)*y+9 = 0
6*y+(18/6)*y+9 = 0
9*y+9 = 0 // - 9
9*y = -9 // : 9
y = -9/9
y = -1
y in (-oo:-1) U (-1:+oo)
(4*y-((16/4)*y)+16)/(6*y+(18/6)*y+9) = 0
(4*y-4*y+16)/(6*y+(18/6)*y+9) = 0
16/(9*y+9) = 0
y belongs to the empty set
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