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Y in (-oo:+oo)
Y/2 = 6.5 // - 6.5
Y/2-6.5 = 0
1/2*Y-6.5 = 0 // + 6.5
1/2*Y = 6.5 // : 1/2
Y = 6.5/1/2
Y = 13
Y = 13
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