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x in (-oo:+oo)
(6/7)*x-(3/7) = 9 // - 9
(6/7)*x-(3/7)-9 = 0
(6/7)*x-3/7-9 = 0
6/7*x-66/7 = 0 // + 66/7
6/7*x = 66/7 // : 6/7
x = 66/7/6/7
x = 11
x = 11
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