Case 1: 3x - 7 >= 0 and x + 1 >= 0
3x >= 7 x >= -1
x >= 7/3
Comgining the above: x >= 7/3
3x - 7 = x + 1
2x = 8
x = 4
Case 2: 3x - 7 >= 0 and x + 1 < 0
3x >= 7 x < -1
x >= 7/3
Combining the above: impossible
Case 3: 3x - 7 < 0 and x + 1 >=0
3x < 7 x >= -1
x < 7/3
Combining the above: -1 <= x < 7/3
-(3x - 7) = x + 1
-3x + 7 = x + 1
-4x = -6
x = 3/2
Case 4: 3x - 7 < 0 and x + 1 < 0
3x < 7 x < -1
x < 7/3
Combining the above: -1 < x < 7/3
-(3x - 7) = -(x + 1)
-3x + 7 = -x - 1
-4x = -11
x = 11/4 (Impossible, not in the required region for x)
The two answers are in bold.