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n in (-oo:+oo)
(12/13)*n = -31/16 // + -31/16
(12/13)*n-(-31/16) = 0
(12/13)*n+31/16 = 0
12/13*n+31/16 = 0 // - 31/16
12/13*n = -31/16 // : 12/13
n = -31/16/12/13
n = -403/192
n = -403/192
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