1) 2(a+3b)-(c-d)

= 2a + 6b - c + d

2) 0.3(3a-2)-(b+2)

= 0.9a - 0.6 - b - 2

= 0.9a - b - 2.6

3) 1.5(4a-3)-5(b+2)

= 6a - 4.5 - 5b - 10

= 6a - 5b - 14.5