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Y in (-oo:+oo)
Y/3 = 13/3 // - 13/3
Y/3-(13/3) = 0
Y/3-13/3 = 0
1/3*Y-13/3 = 0 // + 13/3
1/3*Y = 13/3 // : 1/3
Y = 13/3/1/3
Y = 13
Y = 13
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