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n in (-oo:+oo)
-(5*n)-4 = -19 // + 19
19-(5*n)-4 = 0
19-5*n-4 = 0
15-5*n = 0 // - 15
-5*n = -15 // : -5
n = -15/(-5)
n = 3
n = 3
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