1,3x-4+2x=4x-3
5x-4x=4-3
x=1
2,2.8x=19.32-6.4x
2.8x+6.4x=19.32
9.2x=19.32
x=2.1
3,0.4(x-0.2)+1.5=0.7x-0.38
0.4x-0.08+1.5=0.7x-0.38
1.42+0.38=0.7x-0.4x
0.3x=1.8
x=6
4,6(3x-2)-4(4x-3)=1
18x-12-16x+12=1
2x=1
x=1/2