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X in (-oo:+oo)
X/6.1 = 6.6 // - 6.6
X/6.1-6.6 = 0
0.16393443*X-6.6 = 0 // + 6.6
0.16393443*X = 6.6 // : 0.16393443
X = 6.6/0.16393443
X = 40.25999907
X = 40.25999907
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