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n in (-oo:+oo)
(5/6)*n-((2/3)*n)+3/4 = 85/108 // - 85/108
(5/6)*n-((2/3)*n)+3/4-(85/108) = 0
(-2/3)*n+(5/6)*n+3/4-85/108 = 0
1/6*n-1/27 = 0 // + 1/27
1/6*n = 1/27 // : 1/6
n = 1/27/1/6
n = 2/9
n = 2/9
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