7/30 + 3/20 - 4 1/4 tolong banti ya kak

7/30 + 3/20 - 4 1/4 =
7*2/60 + 3*3/60 - 4 1*15/60
14/60 + 9/60 - 4 15/60
23/60 - 4 15/60
= ( -4 8/60 )
= (-4 2/15)

7/30 + 3/20 - 17/4
14/60+9/60-255/60
-232/60
3 52/60
3 13/15