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n in (-oo:+oo)
(8/1)*(n-10) = 64 // - 64
(8/1)*(n-10)-64 = 0
8*(n-10)-64 = 0
8*(n-10)-64 = 0
8*n-144 = 0
8*n-144 = 0
8*n-144 = 0 // + 144
8*n = 144 // : 8
n = 144/8
n = 18
n = 18
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