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If $5690_w51_h19.png$, which of the following best describes a ?

A a = 7 or a = -7
Explaination
The absolute value is the positive magnitude of a particular number or variable and is indicated by two vertical lines: |−7|=7. In the case of a variable absolute value (|a|=7) the value of a can be either positive or negative (a = -7 or a = 7).
B a = 7
C a = -7