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n in (-oo:+oo)
(5/4)*n-((7/3)*n)-(13/8) = 0
(5/4)*n+(-7/3)*n-13/8 = 0
-13/12*n-13/8 = 0 // + 13/8
-13/12*n = 13/8 // : -13/12
n = 13/8/(-13/12)
n = -3/2
n = -3/2
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