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x in (-oo:+oo)
V = (22/7)*x^4*x^7 // - (22/7)*x^4*x^7
V-((22/7)*x^4*x^7) = 0
V+(-22/7)*x^11 = 0
-22/7*x^11 = -V // : -22/7
x^11 = 7/22*V
x^11 = 7/22*V // ^ 1/11
x = (7/22)^(1/11)*V^(1/11)
x = (7/22)^(1/11)*V^(1/11)
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