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n in (-oo:+oo)
(1/2)*n-((5/6)*n)+3/10 = 19/30 // - 19/30
(1/2)*n-((5/6)*n)+3/10-(19/30) = 0
(1/2)*n+(-5/6)*n+3/10-19/30 = 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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