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x in (-oo:+oo)
y = (x^7)/3 // - (x^7)/3
y-((x^7)/3) = 0
-1/3*x^7 = -y // : -1/3
x^7 = 3*y
x^7 = 3*y // ^ 1/7
x = 3^(1/7)*y^(1/7)
x = 3^(1/7)*y^(1/7)
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