simplify expression 3/4-2/5*7/12

(3/4)-(2/5*7/12)

3/4 -[(2/5)*(7/12)]       perform the multiplication in the brackets, first

3/4 - (14/60)         reduce 14/60 = 7/30

3/4 - (7/30)

[30(3) - 4(7)] / 120

62/120 =

31/ 60