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Y in (-oo:+oo)
Y/6.4 = 4 // - 4
Y/6.4-4 = 0
0.15625*Y-4 = 0 // + 4
0.15625*Y = 4 // : 0.15625
Y = 4/0.15625
Y = 25.6
Y = 25.6
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