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n in (-oo:+oo)
(4/5)*n-(6*n)-4 = -166/35 // + -166/35
(4/5)*n-(6*n)-(-166/35)-4 = 0
(4/5)*n-6*n+166/35-4 = 0
26/35-26/5*n = 0 // - 26/35
-26/5*n = -26/35 // : -26/5
n = -26/35/(-26/5)
n = 1/7
n = 1/7
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