(1)
2
5 x+
2
3 x=
8
9 ,
16
15 x=
8
9 ,
16
15 x ÷
16
15 =
8
9 ÷
16
15 ,
x=
5
6 ;
(2)
3
4 x-
5
12 =
5
6 ,
3
4 x-
5
12 +
5
12 =
5
6 +
5
12 ,
3
4 x ÷
3
4 =
15
12 ÷
3
4 ,
x=1
2
3 .
(1)
2
5 x+
2
3 x=
8
9 ,
16
15 x=
8
9 ,
16
15 x ÷
16
15 =
8
9 ÷
16
15 ,
x=
5
6 ;
(2)
3
4 x-
5
12 =
5
6 ,
3
4 x-
5
12 +
5
12 =
5
6 +
5
12 ,
3
4 x ÷
3
4 =
15
12 ÷
3
4 ,
x=1
2
3 .