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y in (-oo:+oo)
1/2 = y+5/6 // - y+5/6
1/2-y-(5/6) = 0
1/2-y-5/6 = 0
-y-1/3 = 0 // + 1/3
-y = 1/3 // * -1
y = -1/3
y = -1/3
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