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y in (-oo:+oo)
1/2 = y+4/5 // - y+4/5
1/2-y-(4/5) = 0
1/2-y-4/5 = 0
-y-3/10 = 0 // + 3/10
-y = 3/10 // * -1
y = -3/10
y = -3/10
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