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((13*x)/2)*x^2-7 = 1 // - 1
((13*x)/2)*x^2-7-1 = 0
13/2*x^3 = 8 // : 13/2
x^3 = 16/13
x^3 = 16/13 // ^ 1/3
x = (16/13)^(1/3)
x = (16/13)^(1/3)
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