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x in (-oo:+oo)
p-20 = (55/9)*x^12 // - (55/9)*x^12
p-((55/9)*x^12)-20 = 0
p+(-55/9)*x^12-20 = 0
-55/9*x^12 = -(p-20) // : -55/9
x^12 = -9/55*(20-p)
x^12 = -9/55*(20-p) // ^ 1/12
abs(x) = (-9/55)^(1/12)*(20-p)^(1/12)
x = (-9/55)^(1/12)*(20-p)^(1/12) or x = -((-9/55)^(1/12)*(20-p)^(1/12))
x in { (-9/55)^(1/12)*(20-p)^(1/12), -((-9/55)^(1/12)*(20-p)^(1/12)) }
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