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5*x = (1/2)^2-28 // - (1/2)^2-28
5*x-(1/2)^2+28 = 0
5*x+111/4 = 0 // - 111/4
5*x = -111/4 // : 5
x = -111/4/5
x = -111/20
x = -111/20
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