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n in (-oo:+oo)
7-((1/4)*n) = 4 // - 4
7-((1/4)*n)-4 = 0
(-1/4)*n-4+7 = 0
3-1/4*n = 0 // - 3
-1/4*n = -3 // : -1/4
n = -3/(-1/4)
n = 12
n = 12
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