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X in (-oo:+oo)
X/(-2) = 7/8 // - 7/8
X/(-2)-(7/8) = 0
X/(-2)-7/8 = 0
-1/2*X-7/8 = 0 // + 7/8
-1/2*X = 7/8 // : -1/2
X = 7/8/(-1/2)
X = -7/4
X = -7/4
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