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X in (-oo:+oo)
X/(-12) = 9-3 // - 9-3
X/(-12)-9+3 = 0
-1/12*X-6 = 0 // + 6
-1/12*X = 6 // : -1/12
X = 6/(-1/12)
X = -72
X = -72
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