21|x-5|=168
|x-5|=168/21
|x-5|=8
1)x-5=8
x=13
2)x-5=-8
x=-3
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21|x-5|=168
|x-5|=168/21
|x-5|=8
1)x-5=8
x=13
2)x-5=-8
x=-3