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a in (-oo:+oo)
(-1/2)*(4-(6*a)) = 0
(-1/2)*(4-6*a) = 0
-1/2*(4-6*a) = 0
( -1/2 )
-1/2 = 0
a belongs to the empty set
( 4-6*a )
4-6*a = 0 // - 4
-6*a = -4 // : -6
a = -4/(-6)
a = 2/3
a = 2/3
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