3/2r-4=r

3/2r - 4 = r

1.5r - 4 = r

1.5r = r + 4

1.5r - r = 4

0.5r = 4

0.5r/0.5 = 4/0.5

r = 8

Checking:

3/2( 8 ) - 4 = 8

1.5( 8 ) - 4 = 8

12 - 4 = 8

8 = 8

2006-11-28 20:36:56 補充：
I want to help you!!!

3/2r-4=r
3/2r-r=4
1/2r=4
1/2r=4*2
r=8

3/2r-4=r
2r-4=3r
-4=3r-2r
-4=r

3/2r－4=r
3r－8=2r（全式ｘ２）
3r－2r=8（調位）
r=8

3/2r-4=r

3/2r - r = 4

r/2=4
r = 8

3/2r-4=r
3/2r=r+4
3r=2r+8
r=8

3/2r =4+r
3 =4+r * 2r
3-4 =2r square
-1/2 =r square
0.707106781 = r

3/2r - r = 4
1/2r =4
r = 4 * 2
r=8