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n in (-oo:+oo)
(1/4)*n+2/7 = 23/56 // - 23/56
(1/4)*n+2/7-(23/56) = 0
(1/4)*n+2/7-23/56 = 0
1/4*n-1/8 = 0 // + 1/8
1/4*n = 1/8 // : 1/4
n = 1/8/1/4
n = 1/2
n = 1/2
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