The multiplication of rational numbers -1 / 42 * (1 / 6-3 / 14 + 2 / 3-2 / 7) (writing process)

The multiplication of rational numbers -1 / 42 * (1 / 6-3 / 14 + 2 / 3-2 / 7) (writing process)

=-1/42*(1/6+2/3-3/14-2/7)
=-1/42(5/6-7/14)
=-1/42(5/6-1/2)
=-1/42*1/3
=-1/126