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X^2-(2*x)-(48/6) = 0
X^2-2*x-8 = 0
X^2-2*x-8 = 0 // - X^2-8
-2*x = -(X^2-8) // : -2
x = (-(X^2-8))/(-2)
x = (8-X^2)/(-2)
x = (8-X^2)/(-2)
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