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n in (-oo:+oo)
(1/5)*(20*n-15) = 15*(10*n-5) // - 15*(10*n-5)
(1/5)*(20*n-15)-(15*(10*n-5)) = 0
(1/5)*(20*n-15)-15*(10*n-5) = 0
1/5*(20*n-15)-15*(10*n-5) = 0
1/5*(20*n-15)-15*(10*n-5) = 0
72-146*n = 0
72-146*n = 0
72-146*n = 0 // - 72
-146*n = -72 // : -146
n = -72/(-146)
n = 36/73
n = 36/73
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