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X in (-oo:+oo)
X/(-2.1) = 8.5 // - 8.5
X/(-2.1)-8.5 = 0
-0.47619048*X-8.5 = 0 // + 8.5
-0.47619048*X = 8.5 // : -0.47619048
X = 8.5/(-0.47619048)
X = -17.84999986
X = -17.84999986
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