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The equation is a quadratic in x2, so using the quadratic formula:
x2 = [7 +/- √45]/2
so that x2 = 0.145898 or x2 = 6.854102
then x = √0.145898 = -0.381966 or +0.381966
or x = √6.854102 = -2.618034 or +2.618034
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