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y in (-oo:+oo)
1/2 = y+5/7 // - y+5/7
1/2-y-(5/7) = 0
1/2-y-5/7 = 0
-y-3/14 = 0 // + 3/14
-y = 3/14 // * -1
y = -3/14
y = -3/14
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