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n in (-oo:+oo)
(3/4)*n-(4*n)-4/5 = 49/20 // - 49/20
(3/4)*n-(4*n)-4/5-(49/20) = 0
(3/4)*n-4*n-4/5-49/20 = 0
-13/4*n-13/4 = 0 // + 13/4
-13/4*n = 13/4 // : -13/4
n = 13/4/(-13/4)
n = -1
n = -1
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