The expression is 
\
\
(Substitute:
)
Apply the order of operations (PEDMAS). \ \
\\
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First operation is evaluating expression inside the brackets.
\
\
(Subtract:
)
\
\
(Multiply:
)
\
\
(Add:
)
\
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Next operation is addition.
\
\
=10.5 (Add:
)
The value of the expression is 10.5
\