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n in (-oo:+oo)
(-1/2)*n-(9/10) = 7*n+183/5 // - 7*n+183/5
(-1/2)*n-(7*n)-(9/10)-(183/5) = 0
(-1/2)*n-7*n-9/10-183/5 = 0
-15/2*n-75/2 = 0 // + 75/2
-15/2*n = 75/2 // : -15/2
n = 75/2/(-15/2)
n = -5
n = -5
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