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n in (-oo:+oo)
(4/7)*n-5*n-(3/4) = -1261/28 // + -1261/28
(4/7)*n-5*n-(3/4)-(-1261/28) = 0
(4/7)*n-5*n-3/4+1261/28 = 0
310/7-31/7*n = 0 // - 310/7
-31/7*n = -310/7 // : -31/7
n = -310/7/(-31/7)
n = 10
n = 10
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