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x in (-oo:+oo)
(6/7)*x-(8/7) = 3 // - 3
(6/7)*x-(8/7)-3 = 0
(6/7)*x-8/7-3 = 0
6/7*x-29/7 = 0 // + 29/7
6/7*x = 29/7 // : 6/7
x = 29/7/6/7
x = 29/6
x = 29/6
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