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X in (-oo:+oo)
X/(-1.8) = 7.2 // - 7.2
X/(-1.8)-7.2 = 0
-0.55555556*X-7.2 = 0 // + 7.2
-0.55555556*X = 7.2 // : -0.55555556
X = 7.2/(-0.55555556)
X = -12.9599999
X = -12.9599999
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