42x + 2 = 3·4x
42x - 3·4x + 2 = 0 (subtract 3·4x from both sides)
(4x - 2)(4x - 1) = 0
Either: (4x - 2) = 0 ---> 4x = 2 ---> (22)x = 21 ---> 22x = 21 ---> 2x = 1 ---> x = ½
Or: (4x - 1) = 0 ---> 4x = 1 ---> 4x = 40 ---> x = 0
The answers are ½ and 0.