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x in (-oo:+oo)
4*(1-((4*x^7)/10)) = 0
4*((-2/5)*x^7+1) = 0
4*(1-2/5*x^7) = 0
( 1-2/5*x^7 )
-2/5*x^7 = -1 // : -2/5
x^7 = 5/2
x^7 = 5/2 // ^ 1/7
x = (5/2)^(1/7)
( 4 )
4 = 0
x belongs to the empty set
x = (5/2)^(1/7)
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