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4 x /5 + x = 1 728

4 x /5 + 5 x /5 =  8 640/5

9 x = 8 640

x =  960

2 x /3 = 988

2 x / 3 = 2 964 /3

2 x = 2 964

x = 1 482

18 + 2 x = 40 + x

2 x - x = 40 - 18

x = 22

12 x - 3 = 5 x + 18

12 x - 5 x = 18 + 3

7 x = 21

x = 21/7 = 3

8 x - 3/4 = 2 x - 1 /4

8 x - 2 x =  - 1/4 + 3/4

6 x =  2/4

24 x /4 = 2 /4

24 x = 2

x = 1/12

24 x /7 + 1/14 = 3 /28

96 x /28 + 2/28 = 3 /28

96 x = 3 - 2

96 x = 1

x = 1/96