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n in (-oo:+oo)
(-2/5)*n+1/4 = -19/20 // + -19/20
(-2/5)*n+1/4-(-19/20) = 0
(-2/5)*n+1/4+19/20 = 0
6/5-2/5*n = 0 // - 6/5
-2/5*n = -6/5 // : -2/5
n = -6/5/(-2/5)
n = 3
n = 3
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