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2*x^10-(28/4)-5 = 0
2*x^10-7-5 = 0
2*x^10 = 12 // : 2
x^10 = 6
x^10 = 6 // ^ 1/10
abs(x) = 6^(1/10)
x = 6^(1/10) or x = -6^(1/10)
x in { 6^(1/10), -6^(1/10) }
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