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X in (-oo:+oo)
X/(-5) = -2.8 // + 2.8
X/(-5)+2.8 = 0
2.8-1/5*X = 0 // - 2.8
-1/5*X = -2.8 // : -1/5
X = -2.8/(-1/5)
X = 14
X = 14
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