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n in (-oo:+oo)
1/5-(3*n) = -31/20 // + -31/20
1/5-(3*n)-(-31/20) = 0
1/5-3*n+31/20 = 0
7/4-3*n = 0 // - 7/4
-3*n = -7/4 // : -3
n = -7/4/(-3)
n = 7/12
n = 7/12
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