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n in (-oo:+oo)
37/10-n = -39/20 // + -39/20
37/10-n-(-39/20) = 0
37/10-n+39/20 = 0
113/20-n = 0 // - 113/20
-n = -113/20 // * -1
n = 113/20
n = 113/20
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