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n in (-oo:+oo)
2*n-6 = 74-6*n // - 74-6*n
2*n-(-6*n)-74-6 = 0
2*n+6*n-74-6 = 0
8*n-80 = 0 // + 80
8*n = 80 // : 8
n = 80/8
n = 10
n = 10
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