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y in (-oo:+oo)
y/4+y/2 = 4/5 // - 4/5
y/4+y/2-(4/5) = 0
y/4+y/2-4/5 = 0
3/4*y-4/5 = 0 // + 4/5
3/4*y = 4/5 // : 3/4
y = 4/5/3/4
y = 16/15
y = 16/15
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