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n in (-oo:+oo)
20-((1/5)*n) = -17 // + 17
17-((1/5)*n)+20 = 0
(-1/5)*n+17+20 = 0
37-1/5*n = 0 // - 37
-1/5*n = -37 // : -1/5
n = -37/(-1/5)
n = 185
n = 185
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