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n in (-oo:+oo)
(5/6)*n-(7/12) = (-3/4)*n-(13/6) // - (-3/4)*n-(13/6)
(5/6)*n-((-3/4)*n)-(7/12)+13/6 = 0
(5/6)*n+(3/4)*n-7/12+13/6 = 0
19/12*n+19/12 = 0 // - 19/12
19/12*n = -19/12 // : 19/12
n = -19/12/19/12
n = -1
n = -1
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