Algebra (someone plz help)

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i'm really confused on questions like these... Any help guys??
|x| + 5 = 18
A) 5 or -5
B) 13 or -13**
C) 18 or -18
D) 23 or -23
I think b.. I'm not sure if I did it right though..

  • Algebra (someone plz help) -

    subtracting 5 ... |x| = 13

    so ... x = ± 13

    your answer is correct

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