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A in (-oo:+oo)
A/7-(5/7) = 6/7 // - 6/7
A/7-(5/7)-(6/7) = 0
A/7-5/7-6/7 = 0
1/7*A-11/7 = 0 // + 11/7
1/7*A = 11/7 // : 1/7
A = 11/7/1/7
A = 11
A = 11
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