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n in (-oo:+oo)
2*n+4/5 = -4/5 // + -4/5
2*n+4/5-(-4/5) = 0
2*n+4/5+4/5 = 0
2*n+8/5 = 0 // - 8/5
2*n = -8/5 // : 2
n = -8/5/2
n = -4/5
n = -4/5
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