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x in (-oo:+oo)
4-(2*x) = x/2+8 // - x/2+8
4-(2*x)-(x/2)-8 = 0
4-2*x-(x/2)-8 = 0
-5/2*x-4 = 0 // + 4
-5/2*x = 4 // : -5/2
x = 4/(-5/2)
x = -8/5
x = -8/5
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