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n in (-oo:+oo)
-20 = (1/3)*n-10 // - (1/3)*n-10
10-((1/3)*n)-20 = 0
(-1/3)*n-20+10 = 0
-1/3*n-10 = 0 // + 10
-1/3*n = 10 // : -1/3
n = 10/(-1/3)
n = -30
n = -30
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