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n in (-oo:+oo)
7*(2*n+8) = 224 // - 224
7*(2*n+8)-224 = 0
7*(2*n+8)-224 = 0
14*n-168 = 0
14*n-168 = 0
14*n-168 = 0 // + 168
14*n = 168 // : 14
n = 168/14
n = 12
n = 12
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