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x in (-oo:+oo)
(1/5)*(1-(4*x)) = 0
(1/5)*(1-4*x) = 0
1/5*(1-4*x) = 0
( 1-4*x )
1-4*x = 0 // - 1
-4*x = -1 // : -4
x = -1/(-4)
x = 1/4
( 1/5 )
1/5 = 0
x belongs to the empty set
x = 1/4
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