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X in (-oo:+oo)
X/(-7) = 3-1 // - 3-1
X/(-7)-3+1 = 0
-1/7*X-2 = 0 // + 2
-1/7*X = 2 // : -1/7
X = 2/(-1/7)
X = -14
X = -14
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