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n in (-oo:+oo)
6*n+1 = -4/5 // + -4/5
6*n-(-4/5)+1 = 0
6*n+4/5+1 = 0
6*n+9/5 = 0 // - 9/5
6*n = -9/5 // : 6
n = -9/5/6
n = -3/10
n = -3/10
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