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n in (-oo:+oo)
5*(-n-9) = 10 // - 10
5*(-n-9)-10 = 0
5*(-n-9)-10 = 0
-5*n-55 = 0
-5*n-55 = 0
-5*n-55 = 0 // + 55
-5*n = 55 // : -5
n = 55/(-5)
n = -11
n = -11
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