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n in (-oo:+oo)
(2/5)*n+18 = n-3 // - n-3
(2/5)*n-n+3+18 = 0
21-3/5*n = 0 // - 21
-3/5*n = -21 // : -3/5
n = -21/(-3/5)
n = 35
n = 35
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