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x in (-oo:+oo)
(1/3)*x-(2/7) = 1 // - 1
(1/3)*x-(2/7)-1 = 0
(1/3)*x-2/7-1 = 0
1/3*x-9/7 = 0 // + 9/7
1/3*x = 9/7 // : 1/3
x = 9/7/1/3
x = 27/7
x = 27/7
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