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n in (-oo:+oo)
(7/4)*n-1 = (4/2)*n-5 // - (4/2)*n-5
(7/4)*n-((4/2)*n)-1+5 = 0
(7/4)*n-2*n-1+5 = 0
4-1/4*n = 0 // - 4
-1/4*n = -4 // : -1/4
n = -4/(-1/4)
n = 16
n = 16
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