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n in (-oo:+oo)
3-((3/4)*n) = 9 // - 9
3-((3/4)*n)-9 = 0
(-3/4)*n-9+3 = 0
-3/4*n-6 = 0 // + 6
-3/4*n = 6 // : -3/4
n = 6/(-3/4)
n = -8
n = -8
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