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n in (-oo:+oo)
(1/7)*n-((1/3)*n)+5 = 241/49 // - 241/49
(1/7)*n-((1/3)*n)-(241/49)+5 = 0
(-1/3)*n+(1/7)*n-241/49+5 = 0
4/49-4/21*n = 0 // - 4/49
-4/21*n = -4/49 // : -4/21
n = -4/49/(-4/21)
n = 3/7
n = 3/7
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