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n in (-oo:+oo)
-15*n = 5/3 // - 5/3
-15*n-(5/3) = 0
-15*n-5/3 = 0
-15*n-5/3 = 0 // + 5/3
-15*n = 5/3 // : -15
n = 5/3/(-15)
n = -1/9
n = -1/9
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