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n in (-oo:+oo)
(2/3)*n+10 = n+91/9 // - n+91/9
(2/3)*n-n-(91/9)+10 = 0
(2/3)*n-n-91/9+10 = 0
-1/3*n-1/9 = 0 // + 1/9
-1/3*n = 1/9 // : -1/3
n = 1/9/(-1/3)
n = -1/3
n = -1/3
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