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x in (-oo:+oo)
-4*(20-((1/3)*x)) = 0
-4*((-1/3)*x+20) = 0
-4*(20-1/3*x) = 0
( -4 )
-4 = 0
x belongs to the empty set
( 20-1/3*x )
20-1/3*x = 0 // - 20
-1/3*x = -20 // : -1/3
x = -20/(-1/3)
x = 60
x = 60
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