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n in (-oo:+oo)
(-1/3)*n+4/5 = (4/7)*n+464/105 // - (4/7)*n+464/105
(-1/3)*n-((4/7)*n)+4/5-(464/105) = 0
(-1/3)*n+(-4/7)*n+4/5-464/105 = 0
-19/21*n-76/21 = 0 // + 76/21
-19/21*n = 76/21 // : -19/21
n = 76/21/(-19/21)
n = -4
n = -4
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