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x in (-oo:+oo)
12/24 = x/8 // - x/8
12/24-(x/8) = 0
1/2-1/8*x = 0 // - 1/2
-1/8*x = -1/2 // : -1/8
x = -1/2/(-1/8)
x = 4
x = 4
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