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x in (-oo:+oo)
4/1 = x/2 // - x/2
4/1-(x/2) = 0
4-(x/2) = 0
4-1/2*x = 0 // - 4
-1/2*x = -4 // : -1/2
x = -4/(-1/2)
x = 8
x = 8
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