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X in (-oo:+oo)
X/(-5.6) = 2.8 // - 2.8
X/(-5.6)-2.8 = 0
-0.17857143*X-2.8 = 0 // + 2.8
-0.17857143*X = 2.8 // : -0.17857143
X = 2.8/(-0.17857143)
X = -15.67999987
X = -15.67999987
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