1. 3x-5=x+8 2x=13 x=6.5
2. -x=2x-1 3x=1 x=1/3
3. 0.4x+8=0.6x 0.2x=8 x=40
4. (x-5)*1/3=2 x-5=6 x=11
5. 1/2+2=3-2*m*1/2 m=0.5