\"\"

\

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The expression is \"\".

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\"\"                        (Substitute x = 7.1 and y = - 2.5)

\

To subtract 7.1 means add – 7.1 and To subtract 12 means add – 12

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\"\"

\

\"\"                       (Add: \"\")

\

\"\"                                      (Add: \"\")\"\"

\

The value of the expression is –21.6.