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n in (-oo:+oo)
8-((1/3)*n)-13 = 0
(-1/3)*n-13+8 = 0
-1/3*n-5 = 0 // + 5
-1/3*n = 5 // : -1/3
n = 5/(-1/3)
n = -15
n = -15
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