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x in (-oo:+oo)
(2/7)*x = 11/21 // - 11/21
(2/7)*x-(11/21) = 0
(2/7)*x-11/21 = 0
2/7*x-11/21 = 0 // + 11/21
2/7*x = 11/21 // : 2/7
x = 11/21/2/7
x = 11/6
x = 11/6
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