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n in (-oo:+oo)
(4/10)*n+1/10 = (5/10)*n+2 // - (5/10)*n+2
(4/10)*n-((5/10)*n)+1/10-2 = 0
(4/10)*n+(-1/2)*n+1/10-2 = 0
-1/10*n-19/10 = 0 // + 19/10
-1/10*n = 19/10 // : -1/10
n = 19/10/(-1/10)
n = -19
n = -19
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