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a in (-oo:+oo)
(-2/3)*(9*a-30) = 0
-2/3*(9*a-30) = 0
( -2/3 )
-2/3 = 0
a belongs to the empty set
( 9*a-30 )
9*a-30 = 0 // + 30
9*a = 30 // : 9
a = 30/9
a = 10/3
a = 10/3
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