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n in (-oo:+oo)
6*n-5 = -2*n-85 // + -2*n-85
6*n-(-2*n)-5+85 = 0
6*n+2*n-5+85 = 0
8*n+80 = 0 // - 80
8*n = -80 // : 8
n = -80/8
n = -10
n = -10
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