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n in (-oo:+oo)
1-(2*n)-(2/5) = 33/20 // - 33/20
1-(2*n)-(2/5)-(33/20) = 0
1-2*n-2/5-33/20 = 0
-2*n-21/20 = 0 // + 21/20
-2*n = 21/20 // : -2
n = 21/20/(-2)
n = -21/40
n = -21/40
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