Tìm x, biết a) 2x + 1/2 = 7/9

a) 2x+12=79

2x=79−12

2x=1418−918

2x=518

x=518:2

x=518.12

x=536

Vậy x=536

b) 34−6x=713

6x=34−713

6x=3952−2852

6x=1152

x=1152:6

x=1152.16

x=11312

Vậy x=11312