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x in (-oo:+oo)
1300 = (1/2)*x^10 // - (1/2)*x^10
1300-((1/2)*x^10) = 0
(-1/2)*x^10+1300 = 0
-1/2*x^10 = -1300 // : -1/2
x^10 = 2600
x^10 = 2600 // ^ 1/10
abs(x) = 2600^(1/10)
x = 2600^(1/10) or x = -2600^(1/10)
x in { 2600^(1/10), -2600^(1/10) }
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