4*0.3 + (8/15)*0.7 - (3+7/15)*0.3= 1.2 + 56/150 - (0.9 + 7/50)= 1.2 + 56/150 - 0.9 - 21/150= 0.3 + 35/150= 0.3 + 7/30= 8/15
