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x in (-oo:+oo)
(1/3)*x = 2/7 // - 2/7
(1/3)*x-(2/7) = 0
(1/3)*x-2/7 = 0
1/3*x-2/7 = 0 // + 2/7
1/3*x = 2/7 // : 1/3
x = 2/7/1/3
x = 6/7
x = 6/7
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