1. The problem is to subtract and simplify two expressions. Since no specific expression is given, let's assume we subtract two algebraic expressions: $$ (a+b) - (c+d) $$. 2. Distribute the subtraction sign to the second parentheses: $$ a + b - c - d $$. 3. Group like terms if possible. Since each term is distinct, the simplified expression is: $$ a + b - c - d $$. 4. This is the simplified form after subtraction.