Let's simplify each equation step by step:

1,2(3-x)-0,3(4x+1)=0
Expanding the terms gives us:
3,6-1,2x-1,2+1,2x=0
Rearranging the terms gives us:
-1,2+3,6=1,2-1,2x+1,2x
Combining the constants gives us:
2,4=0

0,1-0,8(3x-4)
Expanding the terms gives us:
0,1-2,4x+3,2=0
Combining the terms gives us:
-2,3+3,2=-2,4x
Combining the constants gives us:
0,9=-2,4x

Therefore, the simplified equations are: