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n in (-oo:+oo)
n/8 = 3*n-138 // - 3*n-138
n/8-(3*n)+138 = 0
n/8-3*n+138 = 0
138-23/8*n = 0 // - 138
-23/8*n = -138 // : -23/8
n = -138/(-23/8)
n = 48
n = 48
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