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n in (-oo:+oo)
(9/7)*n+2/3 = 5/14 // - 5/14
(9/7)*n+2/3-(5/14) = 0
(9/7)*n+2/3-5/14 = 0
9/7*n+13/42 = 0 // - 13/42
9/7*n = -13/42 // : 9/7
n = -13/42/9/7
n = -13/54
n = -13/54
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