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n in (-oo:+oo)
(2/3)*n+(2/7)*n-2/5 = -662/1155 // + -662/1155
(2/3)*n+(2/7)*n-2/5-(-662/1155) = 0
(2/3)*n+(2/7)*n-2/5+662/1155 = 0
20/21*n+40/231 = 0 // - 40/231
20/21*n = -40/231 // : 20/21
n = -40/231/20/21
n = -2/11
n = -2/11
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