Answer:
x = 1
Step-by-step explanation:
First, try setting the two equal to each other without absolute value
3x - 7 = 3x + 1
0 = 8
That's undefined, so try making one negative. It doesn't matter which, so I'll do the first one.
-(3x - 7) = 3x + 1
7 - 3x = 3x + 1
6 = 6x
1 = x