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n in (-oo:+oo)
56-40 = n/3+10 // - n/3+10
56-(n/3)-40-10 = 0
6-1/3*n = 0 // - 6
-1/3*n = -6 // : -1/3
n = -6/(-1/3)
n = 18
n = 18
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