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n in (-oo:+oo)
(2/3)*n-n+3/5 = 14/15 // - 14/15
(2/3)*n-n+3/5-(14/15) = 0
(2/3)*n-n+3/5-14/15 = 0
-1/3*n-1/3 = 0 // + 1/3
-1/3*n = 1/3 // : -1/3
n = 1/3/(-1/3)
n = -1
n = -1
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