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x in (-oo:+oo)
(2/3)*(15-(6*x)) = 0
(2/3)*(15-6*x) = 0
2/3*(15-6*x) = 0
( 15-6*x )
15-6*x = 0 // - 15
-6*x = -15 // : -6
x = -15/(-6)
x = 5/2
( 2/3 )
2/3 = 0
x belongs to the empty set
x = 5/2
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