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X in (-oo:+oo)
X/(-3) = 1+11 // - 1+11
X/(-3)-11-1 = 0
-1/3*X-12 = 0 // + 12
-1/3*X = 12 // : -1/3
X = 12/(-1/3)
X = -36
X = -36
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