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x in (-oo:+oo)
1/6-(x/2) = x-(5/2) // - x-(5/2)
1/6-(x/2)-x+5/2 = 0
8/3-3/2*x = 0 // - 8/3
-3/2*x = -8/3 // : -3/2
x = -8/3/(-3/2)
x = 16/9
x = 16/9
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