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x in (-oo:+oo)
y = (x/2)*x^6 // - (x/2)*x^6
y-((x/2)*x^6) = 0
(-1/2)*x^7+y = 0
-1/2*x^7 = -y // : -1/2
x^7 = 2*y
x^7 = 2*y // ^ 1/7
x = 2^(1/7)*y^(1/7)
x = 2^(1/7)*y^(1/7)
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