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n in (-oo:+oo)
(-1/4)*n+6*n+9 = 195/14 // - 195/14
(-1/4)*n+6*n-(195/14)+9 = 0
(-1/4)*n+6*n-195/14+9 = 0
23/4*n-69/14 = 0 // + 69/14
23/4*n = 69/14 // : 23/4
n = 69/14/23/4
n = 6/7
n = 6/7
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