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n in (-oo:+oo)
6-((3/4)*n) = 2*n+1/2 // - 2*n+1/2
6-((3/4)*n)-(2*n)-(1/2) = 0
(-3/4)*n-2*n-1/2+6 = 0
11/2-11/4*n = 0 // - 11/2
-11/4*n = -11/2 // : -11/4
n = -11/2/(-11/4)
n = 2
n = 2
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