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n in (-oo:+oo)
2*n-(17/8) = 31/8 // - 31/8
2*n-(17/8)-(31/8) = 0
2*n-17/8-31/8 = 0
2*n-6 = 0 // + 6
2*n = 6 // : 2
n = 6/2
n = 3
n = 3
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