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a in (-oo:+oo)
(-2/9)*(3*a-18) = 0
-2/9*(3*a-18) = 0
( -2/9 )
-2/9 = 0
a belongs to the empty set
( 3*a-18 )
3*a-18 = 0 // + 18
3*a = 18 // : 3
a = 18/3
a = 6
a = 6
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