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x in (-oo:+oo)
x/2-4 = 2*x // - 2*x
x/2-(2*x)-4 = 0
x/2-2*x-4 = 0
-3/2*x-4 = 0 // + 4
-3/2*x = 4 // : -3/2
x = 4/(-3/2)
x = -8/3
x = -8/3
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