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x in (-oo:+oo)
(6/7)*x-(5/7) = 8 // - 8
(6/7)*x-(5/7)-8 = 0
(6/7)*x-5/7-8 = 0
6/7*x-61/7 = 0 // + 61/7
6/7*x = 61/7 // : 6/7
x = 61/7/6/7
x = 61/6
x = 61/6
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