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x in (-oo:+oo)
y = (1/5)*x^10-7 // - (1/5)*x^10-7
y-((1/5)*x^10)+7 = 0
(-1/5)*x^10+y+7 = 0
-1/5*x^10 = -(y+7) // : -1/5
x^10 = 5*(y+7)
x^10 = 5*(y+7) // ^ 1/10
abs(x) = 5^(1/10)*(y+7)^(1/10)
x = 5^(1/10)*(y+7)^(1/10) or x = -(5^(1/10)*(y+7)^(1/10))
x in { 5^(1/10)*(y+7)^(1/10), -(5^(1/10)*(y+7)^(1/10)) }
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