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n in (-oo:+oo)
6*n+9 = 39/7 // - 39/7
6*n-(39/7)+9 = 0
6*n-39/7+9 = 0
6*n+24/7 = 0 // - 24/7
6*n = -24/7 // : 6
n = -24/7/6
n = -4/7
n = -4/7
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