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n in (-oo:+oo)
(6/7)*n-(1/2) = (-3/5)*n-(283/770) // - (-3/5)*n-(283/770)
(6/7)*n-((-3/5)*n)-(1/2)+283/770 = 0
(6/7)*n+(3/5)*n-1/2+283/770 = 0
51/35*n-51/385 = 0 // + 51/385
51/35*n = 51/385 // : 51/35
n = 51/385/51/35
n = 1/11
n = 1/11
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