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x in (-oo:+oo)
(6/7)*x = 6/21 // - 6/21
(6/7)*x-(6/21) = 0
(6/7)*x-2/7 = 0
6/7*x-2/7 = 0 // + 2/7
6/7*x = 2/7 // : 6/7
x = 2/7/6/7
x = 1/3
x = 1/3
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