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n in (-oo:+oo)
-207/49 = (-3/7)*n-n-3 // - (-3/7)*n-n-3
n-((-3/7)*n)-207/49+3 = 0
(3/7)*n+n-207/49+3 = 0
10/7*n-60/49 = 0 // + 60/49
10/7*n = 60/49 // : 10/7
n = 60/49/10/7
n = 6/7
n = 6/7
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