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Solution:
Given |2x + 6| - 4 = 20
Case(i): When 2x + 6 is positive
2x + 6 - 4 = 20
2x + 2 = 20
2x = 18
x = 9
Case(ii): When 2x + 6 is negative
-(2x + 6) - 4 = 20
-2x - 6 - 4 = 20
-2x = 30
x = -15
Summary:
By solving |2x + 6| - 4 = 20, we get solutions as 9, -15.