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2.5*(1/2)*x*x = 88 // - 88
2.5*(1/2)*x*x-88 = 0
1.25*x^2 = 88 // : 1.25
x^2 = 70.4
x^2 = 70.4 // ^ 1/2
abs(x) = 70.4^(1/2)
x = 70.4^(1/2) or x = -70.4^(1/2)
x in { 70.4^(1/2), -70.4^(1/2) }
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