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Y in (-oo:+oo)
Y/6.5-3.9 = 2.1 // - 2.1
Y/6.5-3.9-2.1 = 0
0.15384615*Y-6 = 0 // + 6
0.15384615*Y = 6 // : 0.15384615
Y = 6/0.15384615
Y = 39.00000098
Y = 39.00000098
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