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n in (-oo:+oo)
(3/4)*n+1 = 4*n+1 // - 4*n+1
(3/4)*n-(4*n)-1+1 = 0
(3/4)*n-4*n-1+1 = 0
-13/4*n = 0 // : -13/4
n = 0
n = 0
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