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n in (-oo:+oo)
(1/5)*(15*n+5) = 8*n-9 // - 8*n-9
(1/5)*(15*n+5)-(8*n)+9 = 0
(1/5)*(15*n+5)-8*n+9 = 0
1/5*(15*n+5)-8*n+9 = 0
1/5*(15*n+5)-8*n+9 = 0
1-5*n+9 = 0
10-5*n = 0
10-5*n = 0
10-5*n = 0 // - 10
-5*n = -10 // : -5
n = -10/(-5)
n = 2
n = 2
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