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n in (-oo:+oo)
(1/2)*(12*n-8) = 26 // - 26
(1/2)*(12*n-8)-26 = 0
1/2*(12*n-8)-26 = 0
1/2*(12*n-8)-26 = 0
6*n-30 = 0
6*n-30 = 0
6*n-30 = 0 // + 30
6*n = 30 // : 6
n = 30/6
n = 5
n = 5
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