nilai x yang memenuhi nilai | 2x + 7 | = 9

| 2x+7 | = 9

2x+7 = 2x+7 utk x > 7/2
-2x-7 utk x < 7/2
utk x > 7/2 » 2x+7 = 9
2x = 2
x = 1 (tdk terpenuhi)
utk x < 7/2 » -2x-7 = 9
-2x = 16
x = -8 (terpenuhi)
HP = {-8}