kak tolong hasil paling sederhana dari pecahan ini apa 3/4-7 + 3/21 - 1/6 =

3/4 - 7 + 3/21 - 1/6 
= (3/4 - 28/4) + (6/42 - 7/42)
=( - 25/4 ) + (-1/42 )
= (-1050/168) + (-4/168)
= -1054/168 
= -527/84