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D( y )
2*y+3 = 0
2*y+3 = 0
2*y+3 = 0
2*y+3 = 0 // - 3
2*y = -3 // : 2
y = -3/2
y in (-oo:-3/2) U (-3/2:+oo)
(10*y^2+21*y+18)/(2*y+3) = 0
10*y^2+21*y+18 = 0
10*y^2+21*y+18 = 0
DELTA = 21^2-(4*10*18)
DELTA = -279
DELTA < 0
1 = 0
1/(2*y+3) = 0
y belongs to the empty set
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