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n in (-oo:+oo)
3-(5*n) = 13 // - 13
3-(5*n)-13 = 0
3-5*n-13 = 0
-5*n-10 = 0 // + 10
-5*n = 10 // : -5
n = 10/(-5)
n = -2
n = -2
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