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Y in (-oo:+oo)
Y/4 = 6.4 // - 6.4
Y/4-6.4 = 0
1/4*Y-6.4 = 0 // + 6.4
1/4*Y = 6.4 // : 1/4
Y = 6.4/1/4
Y = 25.6
Y = 25.6
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