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n in (-oo:+oo)
555/392 = 2*n+(6/7)*n-(5/8) // - 2*n+(6/7)*n-(5/8)
555/392-(2*n)-((6/7)*n)+5/8 = 0
(-6/7)*n-2*n+555/392+5/8 = 0
100/49-20/7*n = 0 // - 100/49
-20/7*n = -100/49 // : -20/7
n = -100/49/(-20/7)
n = 5/7
n = 5/7
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