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x in (-oo:+oo)
(3/7)*x = 2/9 // - 2/9
(3/7)*x-(2/9) = 0
(3/7)*x-2/9 = 0
3/7*x-2/9 = 0 // + 2/9
3/7*x = 2/9 // : 3/7
x = 2/9/3/7
x = 14/27
x = 14/27
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