Question 782798
absolute value of |2b + 4| is 2b + 4

|2b + 4| -3 = 6b + 1
2b + 4 - 3 = 6b + 1
2b + 1 = 6b + 1
1 - 1 = 6b - 2b
0 = 4b
0 = b

check:

|2(0) +4| -3 = 6(-) +1
|4| -3 = 1
4 - 3 = 1
1 = 1