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n in (-oo:+oo)
6*n-(4*n)+7 = -7 // + 7
6*n-(4*n)+7+7 = 0
6*n-4*n+7+7 = 0
2*n+14 = 0 // - 14
2*n = -14 // : 2
n = -14/2
n = -7
n = -7
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