3 | x - 7 | = 15
Divide both sides by 3
3 | x - 7 | ÷ 3 = 15 ÷ 3
| x - 7 | = 5
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" Reminder "
| a | = t ===》 a = + t OR a = - t
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x - 7 = 5 ====》 x = 12
OR
x - 7 = - 5 ===》 x = 2
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