(-3/7-5/14-8/21)×3/14+1/8=?

(-3/7-5/14-8/21)×3/14+1/8=(-6/14-5/14-8/21)×3/14+1/8=(-11/14-8/21)×3/14+1/8=(-33/42-16/42)×3/14+1/8=-49/42×3/14+1/8=-49/42×3/14+1/8=-1/4+1/8=-2/8+1/8=-1/8