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Why is x>0 ??

https://brilliant.org/curriculum-mathematics-problem/algebra-and-trigonometry-problem-5546/

in this question why did he write a condition that x is more than zero in the beginning ....i mean x can be a negative or positive number it doesn't matter as there's an absolute!!

Note by Eman Abulmagd
3 years, 3 months ago

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