(x - 1)/65 + (x - 3)/63 = (x - 5)/61 + (x - 7)/59, (x + 1)/65 + (x + 3)/63 - (x + 5)/61 - (x + 7)/59, x - 1/65 + x - 3/63 = x - 5/61 + x - 7/59, x + 1/ 65 + x + 3/ 63 = x + 5/61 + x + 7/ 59