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n in (-oo:+oo)
3/4-((1/2)*n) = 4/5 // - 4/5
3/4-((1/2)*n)-(4/5) = 0
(-1/2)*n+3/4-4/5 = 0
-1/2*n-1/20 = 0 // + 1/20
-1/2*n = 1/20 // : -1/2
n = 1/20/(-1/2)
n = -1/10
n = -1/10
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