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n in (-oo:+oo)
(10/12)*n = -30/39 // + -30/39
(10/12)*n-(-30/39) = 0
(10/12)*n+10/13 = 0
5/6*n+10/13 = 0 // - 10/13
5/6*n = -10/13 // : 5/6
n = -10/13/5/6
n = -12/13
n = -12/13
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