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(1) 8 9x = 7 12 , 63x=8×12, 63x

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(1) 8 9x = 7 12 , 63x=8×12, 63x
(1)
8
9x =
7
12 ,
63x=8×12,
63x÷63=8×12÷63,
x=
32
21 ;

(2)2.4:
3
2 =3.2:x,
2.4x=3.2×
3
2 ,
2.4x÷2.4=3.2×
3
2 ÷2.4,
x=2;

(3)
28
3 x=
49
9 ×
9
7 ,
28
3 x÷
28
3 =
49
9 ×
9
7 ÷
28
3 ,
x=
3
4 ;

(4)
3
2 ×3+2.75x=
19
3 ,
9
2 +2.75x=
19
3 ,
9
2 +2.75x-
9
2 =
19
3 -
9
2 ,
2.75x=
11
6 ,
2.75x÷2.75=
11
6 ÷2.75,
x=
2
3 ;

(5) 5.6x-
3
5 x=4.8 ,
5x=4.8,
5x÷5=4.8÷5,
x=0.96;

(6)5x-3×
7
10 =
7
5 ,
5x-
21
10 =
7
5 ,
5x-
21
10 +
21
10 =
7
5 +
21
10 ,
5x=
35
10 ,
5x÷5=
35
10 ÷5,
x=
7
10 .