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y in (-oo:+oo)
(2/3)*(21-(18*y)) = 0
(2/3)*(21-18*y) = 0
2/3*(21-18*y) = 0
( 2/3 )
2/3 = 0
y belongs to the empty set
( 21-18*y )
21-18*y = 0 // - 21
-18*y = -21 // : -18
y = -21/(-18)
y = 7/6
y = 7/6
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