If the fourth power of the 3x + 1 power of the algebraic formula - half a is the same as the fourth power of the X + 3 power B of 9a, then X-2 =?

If the fourth power of the 3x + 1 power of the algebraic formula - half a is the same as the fourth power of the X + 3 power B of 9a, then X-2 =?

The title should be - the power of 3x + 1 of a, the power of 4 of B and the power of X + 3 of 9A are similar terms
3x+1=x+3
x=1
x-2=1-2=-1