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x in (-oo:+oo)
(1/3)*x-(1/7) = 8 // - 8
(1/3)*x-(1/7)-8 = 0
(1/3)*x-1/7-8 = 0
1/3*x-57/7 = 0 // + 57/7
1/3*x = 57/7 // : 1/3
x = 57/7/1/3
x = 171/7
x = 171/7
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