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x in (-oo:+oo)
(2/3)*x-(4/7) = 6 // - 6
(2/3)*x-(4/7)-6 = 0
(2/3)*x-4/7-6 = 0
2/3*x-46/7 = 0 // + 46/7
2/3*x = 46/7 // : 2/3
x = 46/7/2/3
x = 69/7
x = 69/7
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