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x in (-oo:+oo)
(2/7)*x = 9/14 // - 9/14
(2/7)*x-(9/14) = 0
(2/7)*x-9/14 = 0
2/7*x-9/14 = 0 // + 9/14
2/7*x = 9/14 // : 2/7
x = 9/14/2/7
x = 9/4
x = 9/4
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