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a in (-oo:+oo)
(2/3)*(9*a-15) = 0
2/3*(9*a-15) = 0
( 2/3 )
2/3 = 0
a belongs to the empty set
( 9*a-15 )
9*a-15 = 0 // + 15
9*a = 15 // : 9
a = 15/9
a = 5/3
a = 5/3
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