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n in (-oo:+oo)
29/21 = (-10/3)*n+1 // - (-10/3)*n+1
29/21-((-10/3)*n)-1 = 0
(10/3)*n+29/21-1 = 0
10/3*n+8/21 = 0 // - 8/21
10/3*n = -8/21 // : 10/3
n = -8/21/10/3
n = -4/35
n = -4/35
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