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a in (-oo:+oo)
1/7-a = 6/7 // - 6/7
1/7-a-(6/7) = 0
1/7-a-6/7 = 0
-a-5/7 = 0 // + 5/7
-a = 5/7 // * -1
a = -5/7
a = -5/7
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