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n in (-oo:+oo)
n/5-0.5 = 0.8 // - 0.8
n/5-0.8-0.5 = 0
1/5*n-1.3 = 0 // + 1.3
1/5*n = 1.3 // : 1/5
n = 1.3/1/5
n = 6.5
n = 6.5
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