g=2/3a solve for a
18ag=12 solve for a
U=2x—4 solve for x
2x+4=u+8 solve for x

Answer:
soln,
here,1st and 2nd case for a
1st case
so,a=3/2g.
2nd case
a=2/3g.
3rd and 4th case for X
3rdcase
(U+4)/2=X
X=(U+4)/2.
4th case
X=(U+4)/2.