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x in (-oo:+oo)
(6/7)*x-(6/7) = 8 // - 8
(6/7)*x-(6/7)-8 = 0
(6/7)*x-6/7-8 = 0
6/7*x-62/7 = 0 // + 62/7
6/7*x = 62/7 // : 6/7
x = 62/7/6/7
x = 31/3
x = 31/3
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