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n in (-oo:+oo)
7/8 = (3*n)/9 // - (3*n)/9
7/8-((3*n)/9) = 0
(-1/3)*n+7/8 = 0
7/8-1/3*n = 0 // - 7/8
-1/3*n = -7/8 // : -1/3
n = -7/8/(-1/3)
n = 21/8
n = 21/8
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