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y in (-oo:+oo)
5/7 = y+4/5 // - y+4/5
5/7-y-(4/5) = 0
5/7-y-4/5 = 0
-y-3/35 = 0 // + 3/35
-y = 3/35 // * -1
y = -3/35
y = -3/35
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