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x in (-oo:+oo)
(2/3)*x = 6/7 // - 6/7
(2/3)*x-(6/7) = 0
(2/3)*x-6/7 = 0
2/3*x-6/7 = 0 // + 6/7
2/3*x = 6/7 // : 2/3
x = 6/7/2/3
x = 9/7
x = 9/7
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