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n in (-oo:+oo)
(1/2)*n+5*11 = 76 // - 76
(1/2)*n+5*11-76 = 0
1/2*n-21 = 0 // + 21
1/2*n = 21 // : 1/2
n = 21/1/2
n = 42
n = 42
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