0.9*46+(4.46+0. 14)
=0.9*46+4.6
=0.9*46+0. 1*46
=46
2 * 1 divided by (3/4-3/8) (you did it right)
=( 1/3)/(3/4-3/8)
=( 1/3)*(4/3)-( 1/3)*(8/3)
=4/9-8/9=-4/9