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y in (-oo:+oo)
3*(7-((3*y)/2)) = 0
3*((-3/2)*y+7) = 0
3*(7-3/2*y) = 0
( 3 )
3 = 0
y belongs to the empty set
( 7-3/2*y )
7-3/2*y = 0 // - 7
-3/2*y = -7 // : -3/2
y = -7/(-3/2)
y = 14/3
y = 14/3
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