# ABS

What is the value of
$\mathrm{\mid }\mathrm{\mid }-81\mathrm{\mid }-\mathrm{\mid }-90\mathrm{\mid }\mathrm{\mid }$
?

Correct result:

x =  9

#### Solution:

$x=\mathrm{\mid }\mathrm{\mid }-81\mathrm{\mid }-\mathrm{\mid }-90\mathrm{\mid }\mathrm{\mid }=\mathrm{\mid }81-90\mathrm{\mid }=\mathrm{\mid }-9\mathrm{\mid }=9$

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