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n in (-oo:+oo)
(8/11)*(n-19) = 64 // - 64
(8/11)*(n-19)-64 = 0
8/11*(n-19)-64 = 0
8/11*(n-19)-64 = 0
8/11*n-856/11 = 0
8/11*n-856/11 = 0
8/11*n-856/11 = 0 // + 856/11
8/11*n = 856/11 // : 8/11
n = 856/11/8/11
n = 107
n = 107
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