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n in (-oo:+oo)
(13/5)*n+2 = -51/21 // + -51/21
(13/5)*n-(-51/21)+2 = 0
(13/5)*n+17/7+2 = 0
13/5*n+31/7 = 0 // - 31/7
13/5*n = -31/7 // : 13/5
n = -31/7/13/5
n = -155/91
n = -155/91
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