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y in (-oo:+oo)
y/4+y/6 = 4/5 // - 4/5
y/4+y/6-(4/5) = 0
y/4+y/6-4/5 = 0
5/12*y-4/5 = 0 // + 4/5
5/12*y = 4/5 // : 5/12
y = 4/5/5/12
y = 48/25
y = 48/25
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