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x in (-oo:+oo)
12/24 = x/108 // - x/108
12/24-(x/108) = 0
1/2-1/108*x = 0 // - 1/2
-1/108*x = -1/2 // : -1/108
x = -1/2/(-1/108)
x = 54
x = 54
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