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n in (-oo:+oo)
(2*(n+5)-8)/2 = 0
2*(n+5)-8 = 0
2*(n+5)-8 = 0
2*n+2 = 0
2*n+2 = 0
(2*n+2)/2 = 0
2*n+2 = 0 // - 2
2*n = -2 // : 2
n = -2/2
n = -1
n = -1
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