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x in (-oo:+oo)
-((((4-x)^3)/4)*(x-6)) = 0
(-1*(4-x)^3*(x-6))/4 = 0
( 4-x )
4-x = 0 // - 4
-x = -4 // * -1
x = 4
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 4, 4, 4, 6 }
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