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a in (-oo:+oo)
(5/6)*(30*a-12) = 0
5/6*(30*a-12) = 0
( 30*a-12 )
30*a-12 = 0 // + 12
30*a = 12 // : 30
a = 12/30
a = 2/5
( 5/6 )
5/6 = 0
a belongs to the empty set
a = 2/5
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