Question

a )
x-4/9=1/3
b )
5/6-x=1/2

Answer 1

a) 9x-4=3
9x=7
x=7/9

b) 5-6x=3
6x=2
3x=1
x=1/3

Answer 2

a) 

x - 4/9 = 1/3 

x = 1/3 + 4/9  → amplific fractia 1/3 cu 3 = ( 3 x 1) / 3 x 3) = 3/9

x = 3/9 + 4/9 = 7/9

Verific:   7/9 - 4/9 = 3/9 = 1/9 

b) 
5/6 - x = 1/2 

x = 5/6 - 1/2  → amplific a doua fractie cu 3 

x = 5/6 - 3/6 = 2/6 = 1/3