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x in (-oo:+oo)
x/2+8 = 2*x+13/2 // - 2*x+13/2
x/2-(2*x)-(13/2)+8 = 0
x/2-2*x-13/2+8 = 0
3/2-3/2*x = 0 // - 3/2
-3/2*x = -3/2 // : -3/2
x = -3/2/(-3/2)
x = 1
x = 1
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