(1)x+2/9=11/15
x=11/15-2/9
x=23/45
(2)9x-1/10=9/10
9x=9/10+1/10
9x=1
x=1/9
(3)1/4+x=4/9
x=4/9-1/4
x=7/36
(4)2x+1/5=6/5
2x=6/5-1/5
2x=1
x=1/2
(1)x+2/9=11/15
x=11/15-2/9
x=23/45
(2)9x-1/10=9/10
9x=9/10+1/10
9x=1
x=1/9
(3)1/4+x=4/9
x=4/9-1/4
x=7/36
(4)2x+1/5=6/5
2x=6/5-1/5
2x=1
x=1/2