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n in (-oo:+oo)
n/12 = 18/7 // - 18/7
n/12-(18/7) = 0
n/12-18/7 = 0
1/12*n-18/7 = 0 // + 18/7
1/12*n = 18/7 // : 1/12
n = 18/7/1/12
n = 216/7
n = 216/7
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