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f in (-oo:+oo)
3*((3.6-(2*f))/10) = 0
3*((3.6-2*f)/10) = 0
(3*(3.6-2*f))/10 = 0
( 3.6-2*f )
3.6-2*f = 0 // - 3.6
-2*f = -3.6 // : -2
f = -3.6/(-2)
f = 1.8
( 3 )
3 = 0
f belongs to the empty set
f = 1.8
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