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n in (-oo:+oo)
649/56 = (-1/7)*n+6*n-(1/8) // - (-1/7)*n+6*n-(1/8)
649/56-((-1/7)*n)-(6*n)+1/8 = 0
(1/7)*n-6*n+649/56+1/8 = 0
82/7-41/7*n = 0 // - 82/7
-41/7*n = -82/7 // : -41/7
n = -82/7/(-41/7)
n = 2
n = 2
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