To calculate the expression 6 + 5 – 6 + 1, you should follow the order of operations, which is commonly known as PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction) or BODMAS (Brackets, Orders, Division and Multiplication, Addition and Subtraction).
In this case, you would first perform the addition and subtraction from left to right:
6 + 5 = 11
11 – 6 = 5
5 + 1 = 6
Therefore, the expression 6 + 5 – 6 + 1 equals 6