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n in (-oo:+oo)
n/5-2 = 3.5 // - 3.5
n/5-3.5-2 = 0
1/5*n-5.5 = 0 // + 5.5
1/5*n = 5.5 // : 1/5
n = 5.5/1/5
n = 27.5
n = 27.5
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