This is not the answer, but I want to tell you that I can't see what the problem says. I would help you, but I can't.
x+142 =3x+64
subtract x from each side
142 = 2x+64
subtract 64 from each side
142-64 = 2x
78=2x
divide by 2
78/2 = x
x=39
The number is 39
