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n in (-oo:+oo)
7*n+1/2 = -103/18 // + -103/18
7*n+1/2-(-103/18) = 0
7*n+1/2+103/18 = 0
7*n+56/9 = 0 // - 56/9
7*n = -56/9 // : 7
n = -56/9/7
n = -8/9
n = -8/9
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