To solve these equations, we need to isolate the variable (x) by performing the necessary operations. Let's solve each equation step by step:

2(2/3)x = 22/5
4/3x = 22/5
x = (22/5)(3/4)
x = 33/10

6.3x = (9/5)7
6.3*x = 63/5
x = (63/5) / 6.3
x = 63/31.5
x = 2

21/(0.7x) = 9.5/1.9
21/(0.7x) = 5
1/(0.7x) = 5/21
1/(0.7x) = 5/21
(0.7*x) = 21/5
x = (21/5) / 0.7
x = 21/7
x = 3

3.4/9 = 17x/4.5
0.3777777778 = 3.7777777778x
x = 0.3777777778 / 3.7777777778
x = 0.1

7.2/(1.17x) = 8/3.9
7.2/(1.17x) = 2.0512820513
1/(1.17x) = 2.0512820513/7.2
1/(1.17x) = 0.2843023256
(1.17*x) = 1/0.2843023256
x = (1/0.2843023256) / 1.17
x = 3.5034965038

1.5x/4 = 9/8
0.375x = 1.125
x = 1.125 / 0.375
x = 3

Therefore, the solutions for x in each of the equations are: