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n in (-oo:+oo)
2*n-5 = 67-6*n // - 67-6*n
2*n-(-6*n)-67-5 = 0
2*n+6*n-67-5 = 0
8*n-72 = 0 // + 72
8*n = 72 // : 8
n = 72/8
n = 9
n = 9
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