23.2x+2-2x+1=32
2x.22-2x.2=32
2x.(22-21)=32
2x.2=32
2x=32:2
2x=16
⇒x=4
24.3x+5+3x+2=756
3x.35+3x.32=756
3x.(35+32)=756
3x.252=756
3x=756:252
3x=3
⇒x=1
26.(2/3)x.(2/3)2+(2/3)x.(2/3)=20/27
(2/3)x.[(2/3)2+(2/3)]=20/27
(2/3)x.10/9=20/27
(2/3)x=20/27:10/9
(2/3)x=2/3
⇒x=1