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n in (-oo:+oo)
(1/2)*(4*n-6) = 11 // - 11
(1/2)*(4*n-6)-11 = 0
1/2*(4*n-6)-11 = 0
1/2*(4*n-6)-11 = 0
2*n-14 = 0
2*n-14 = 0
2*n-14 = 0 // + 14
2*n = 14 // : 2
n = 14/2
n = 7
n = 7
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