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n in (-oo:+oo)
(5/7)*n-9 = -108/7 // + -108/7
(5/7)*n-(-108/7)-9 = 0
(5/7)*n+108/7-9 = 0
5/7*n+45/7 = 0 // - 45/7
5/7*n = -45/7 // : 5/7
n = -45/7/5/7
n = -9
n = -9
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