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x in (-oo:+oo)
(1/5)*x*(2*x-39)^3 = 0
1/5*x*(2*x-39)^3 = 0
( 1/5*x )
1/5*x = 0 // : 1/5
x = 0
( 2*x-39 )
2*x-39 = 0 // + 39
2*x = 39 // : 2
x = 39/2
x in { 0, 39/2, 39/2, 39/2 }
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