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-39.7
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-39.7
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31.5-|-71.2|
The absolute value of a real number a is a when a\geq 0, or -a when a<0. The absolute value of 31.5 is 31.5.
31.5-71.2
The absolute value of a real number a is a when a\geq 0, or -a when a<0. The absolute value of -71.2 is 71.2.
-39.7
Subtract 71.2 from 31.5 to get -39.7.
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