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n in (-oo:+oo)
5*n+7 = n/2 // - n/2
5*n-(n/2)+7 = 0
9/2*n+7 = 0 // - 7
9/2*n = -7 // : 9/2
n = -7/9/2
n = -14/9
n = -14/9
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