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a in (-oo:+oo)
a/7-1 = 6/7 // - 6/7
a/7-(6/7)-1 = 0
a/7-6/7-1 = 0
1/7*a-13/7 = 0 // + 13/7
1/7*a = 13/7 // : 1/7
a = 13/7/1/7
a = 13
a = 13
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