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y in (-oo:+oo)
5*(19.5-((5*y)/2)) = 0
5*((-5/2)*y+19.5) = 0
5*(19.5-5/2*y) = 0
( 19.5-5/2*y )
19.5-5/2*y = 0 // - 19.5
-5/2*y = -19.5 // : -5/2
y = -19.5/(-5/2)
y = 7.8
( 5 )
5 = 0
y belongs to the empty set
y = 7.8
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