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n in (-oo:+oo)
(3/7)*n-(3/5) = -81/35 // + -81/35
(3/7)*n-(3/5)-(-81/35) = 0
(3/7)*n-3/5+81/35 = 0
3/7*n+12/7 = 0 // - 12/7
3/7*n = -12/7 // : 3/7
n = -12/7/3/7
n = -4
n = -4
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