7. d) (-8/9)-[-5/72-(-1/12)+(-11/36)] = -8/9-(-5/72+1/12-11/36) =
= -8/9+5/72-1/12+11/36 = [tex] -\frac{8*8+5*1-1*6+11*2}{72} = - \frac{64+5-6+22}{72} = - \frac{85}{72}[/tex]
8. j) 2*3/7-(-1/2)-4/5 = 17/7+1/2-4/5 = [tex] \frac{17*10+35-4*14}{70} = \frac{149}{70}[/tex]
