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y in (-oo:+oo)
2/3 = y+4/5 // - y+4/5
2/3-y-(4/5) = 0
2/3-y-4/5 = 0
-y-2/15 = 0 // + 2/15
-y = 2/15 // * -1
y = -2/15
y = -2/15
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