The expression is 
(Replace m with 8 and y with 6 in original expression)
Simplify the expression using order of operations (PEMDAS).
\Since there are no grouping symbols and powers, product and quotients,
\First operation is inside the parenthesis.
\
(Multiply:
)
(Subtract:
)
Next operation is addition.
\
(Add:
)
The value of the expression is 52.