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y in (-oo:+oo)
3/7-y = 6/7 // - 6/7
3/7-y-(6/7) = 0
3/7-y-6/7 = 0
-y-3/7 = 0 // + 3/7
-y = 3/7 // * -1
y = -3/7
y = -3/7
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