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n in (-oo:+oo)
(2/5)*n+6 = 1 // - 1
(2/5)*n-1+6 = 0
2/5*n+5 = 0 // - 5
2/5*n = -5 // : 2/5
n = -5/2/5
n = -25/2
n = -25/2
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