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X^2-((1/2)*x)-(3/16) = 0
X^2+(-1/2)*x-3/16 = 0
X^2-1/2*x-3/16 = 0 // - X^2-3/16
-1/2*x = -(X^2-3/16) // : -1/2
x = (-(X^2-3/16))/(-1/2)
x = -2*(3/16-X^2)
x = -2*(3/16-X^2)
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