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n in (-oo:+oo)
(5/6)*n+10 = 7*n-64 // - 7*n-64
(5/6)*n-(7*n)+10+64 = 0
(5/6)*n-7*n+10+64 = 0
74-37/6*n = 0 // - 74
-37/6*n = -74 // : -37/6
n = -74/(-37/6)
n = 12
n = 12
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