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x in (-oo:+oo)
(2/5)*(4-(10*x)) = 0
(2/5)*(4-10*x) = 0
2/5*(4-10*x) = 0
( 2/5 )
2/5 = 0
x belongs to the empty set
( 4-10*x )
4-10*x = 0 // - 4
-10*x = -4 // : -10
x = -4/(-10)
x = 2/5
x = 2/5
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