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x in (-oo:+oo)
13-(x/2) = x-(1/2) // - x-(1/2)
1/2-(x/2)-x+13 = 0
27/2-3/2*x = 0 // - 27/2
-3/2*x = -27/2 // : -3/2
x = -27/2/(-3/2)
x = 9
x = 9
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