Tìm x €N, biết a) (x+14):12-6=4 b)(x+35)-120=0 c)(15+x):3=3mũ6:3mũ3 d)5mũ x.5mũ2=5mũ6

a, `(x+14):12-6=4`

`=> (x+14) : 12 = 8`

`=> x + 14 = 8 . 12 = 96`

`=> x = 82`

b,` (x+35)-120=0`

`=> x + 35 = 120`

`=> x = 85`

c, `(15+x):3=3^6 : 3^3`

`=> (15+x):3=3^3`

`=> 15 + x = 3^4 = 81`

`=> x = 66`

d, `5^x . 5^2 = 5^6`

`=> 5^(x+2)=5^6`

`=> x + 2 = 6`

`=> x = 4`