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x in (-oo:+oo)
648 = (x^1)/2 // - (x^1)/2
648-((x^1)/2) = 0
648-(x/2) = 0
648-1/2*x = 0 // - 648
-1/2*x = -648 // : -1/2
x = -648/(-1/2)
x = 1296
x = 1296
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