The expression is 

Commutative Property of Addition:

For any numbers a and b,

Using Commutative Property of Addition, the statement can be written as

\ \

Associative Property of Addition:

For any numbers a, b and c: 

Using Associative Property of Addition, the statement can be written as

\ \

 To simplify the expression following order of operations to performed:

1.      Evaluate the expressions inside grouping symbols.

2.      Evaluate Powers.

3.      Multiply and/or Divide in order from left to right.

4.      Add and/or Subtract in order from left to right.

According order of operations inside the grouping symbols should be evaluated first.

First operation is adding the numbers within the parenthesis.

    (Add: ) \ \

The simplified expression is 48 + m.