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n in (-oo:+oo)
(-3/5)*n = 9/20 // - 9/20
(-3/5)*n-(9/20) = 0
(-3/5)*n-9/20 = 0
-3/5*n-9/20 = 0 // + 9/20
-3/5*n = 9/20 // : -3/5
n = 9/20/(-3/5)
n = -3/4
n = -3/4
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