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x in (-oo:+oo)
x/2-4 = 2*x-12 // - 2*x-12
x/2-(2*x)-4+12 = 0
x/2-2*x-4+12 = 0
8-3/2*x = 0 // - 8
-3/2*x = -8 // : -3/2
x = -8/(-3/2)
x = 16/3
x = 16/3
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