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x in (-oo:+oo)
x/2+489 = 2*x // - 2*x
x/2-(2*x)+489 = 0
x/2-2*x+489 = 0
489-3/2*x = 0 // - 489
-3/2*x = -489 // : -3/2
x = -489/(-3/2)
x = 326
x = 326
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