x₁ = 3
x₂ = - 12
Hi there !
| 2x + 9 | = 15
1.
2x + 9 = 15
2x = 15 - 9
2x = 6
x = 6 : 2
2.
2x + 9 = - 15
2x = - 15 - 9
2x = - 24
x = - 24 : 2
Good luck !
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