3/14 * (1 + 3i1/5 - 4i1/5 * 3/7 - 1) =
= 3/14 * (1 + 3i1/5 - 21/5 * 3/7 - 1) =
= 3/14 * (4i1/5 - 3/5 * 3/1 - 1) =
= 3/14 * ( 4i1/5 - 9/5 - 1) =
= 3/14 * ( 4i1/5 - 1i4/5 - 1) =
= 3/14 * (3i6/5 - 2i4/5) =
= 3/14 * 1i2/5 =
= 3/14 * 7/5 =
= 3/2 * 1/5 = 3/10
1i2/7 * 2/3 = 9/7 * 2/3 = 3/7 * 2/1 = 6/7