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n in (-oo:+oo)
4*n-(23/4) = 223/4 // - 223/4
4*n-(23/4)-(223/4) = 0
4*n-23/4-223/4 = 0
4*n-123/2 = 0 // + 123/2
4*n = 123/2 // : 4
n = 123/2/4
n = 123/8
n = 123/8
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