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y in (-oo:+oo)
(2/3)*(12*y-15) = 0
2/3*(12*y-15) = 0
( 12*y-15 )
12*y-15 = 0 // + 15
12*y = 15 // : 12
y = 15/12
y = 5/4
( 2/3 )
2/3 = 0
y belongs to the empty set
y = 5/4
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