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A in (-oo:+oo)
A/7-7-5 = 6-7 // - 6-7
A/7-7-6-5+7 = 0
1/7*A-11 = 0 // + 11
1/7*A = 11 // : 1/7
A = 11/1/7
A = 77
A = 77
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