想問一條數學題...快快快!=]

b/3 -5+b=3
b-15+3b=9
4b=24
b=6

by them

b/3-5+b=3
b/3+b=8
4/3b=8
b=6

b
-- － ( 5 - b ) =3
3

3(b/3)-3(5-b)=3(3)

b-15+3b=9

4b=9+15

b=24/4

b=6

b
-- － ( 5 - b ) =3
3

b - (5 - b ) = 3 x 3

b - ( 15 - 3b ) = 9

b - 15 + 3b = 9

b + 3b = 9 + 15

4b = 24

b = 6

b
-- 減 ( 5 - b ) = 3
3

b　　( 5 - b )
-- 減 ---------- = 3
3　　　1

通分母

b　　3( 5 - b )
-- 減 ------------- = 3
3　　　1 x 3

b　　15 - 3b
-- 減 ----------- = 3
3　　　3

負負得正

b - 15 + 3b
---------------- = 3
　　3

4b - 15
---------- x 3 = 3 x 3
　3

4b - 15 = 9
4b = 24
b = 6

ok??

b
-- － ( 5 - b ) =3
3

b - (5 - b ) *3 = 3 * 3
--
3

b - ( 15 - 3b ) = 9

b - 15 + 3b = 9

b + 3b = 9 + 15

4b = 24

b = 6

b/3 - 5+d =3
b/3 + b =3+5
b + 3b =8 x3
4b =24
b = 6