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y in (-oo:+oo)
(3/4)*(4*y+8)*(9*y+18) = 0
3/4*(4*y+8)*(9*y+18) = 0
( 4*y+8 )
4*y+8 = 0 // - 8
4*y = -8 // : 4
y = -8/4
y = -2
( 9*y+18 )
9*y+18 = 0 // - 18
9*y = -18 // : 9
y = -18/9
y = -2
y in { -2, -2 }
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