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X in (-oo:+oo)
X/13.5 = -12.2 // + 12.2
X/13.5+12.2 = 0
0.07407407*X+12.2 = 0 // - 12.2
0.07407407*X = -12.2 // : 0.07407407
X = -12.2/0.07407407
X = -164.70000906
X = -164.70000906
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