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n in (-oo:+oo)
7*(2*n-6) = 112 // - 112
7*(2*n-6)-112 = 0
7*(2*n-6)-112 = 0
14*n-154 = 0
14*n-154 = 0
14*n-154 = 0 // + 154
14*n = 154 // : 14
n = 154/14
n = 11
n = 11
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