Решить )) 1)7х/6=49/14 5)3/14=21/2·(9х+31) 2)2/15=3/5х 6)9/10=63/5·(х+8) 3)8/13=2х/39 4)2/3=28\7х

1)   7x * 14 = 49 * 6

7x = (49 * 6) / 14

7x = 21

x=3

2)  10x = 45  

x = 4.5

3) 26x = 312

x = 312 / 26

x = 12

4)  14x = 84

x = 84/ 14

x = 6

5)   3/14 * 2/21 = 9x + 31

6/294 - 9114/294 = 9x

- 9108/294 = 9x

x = - 9108/2646 = - 3  1170/2646

6)   9/10 * 5/63 = x + 8 

1/14 = x + 8

x = (1 - 112) /14

x = - 111/14

x = - 7  13/14